Practice Test


1) Each of the following is true for white and red phosphorus except that they


2) Which of the following oxides will be least acidic?


3) Which of the following contains a coordinate bond ?


4) Which of the following P is thermodynamical most stable ?


5) Which of the following goes under sublimation?


6) The structure of white phosphorus is


7) The most acidic of the following compound is


8) Which of the following molecule is linear ?


9) Which one of the following oxides of nitrogen is blue solid ?


10) What causes nitrogen to be chemically inert ?


11) In which of the following the bond angle is maximum ?


12) Which one of the following arrangement of molecules is correct on the basis of their dipole moments ?


13) Which of the following is an oxyacid?


14) Which one of the following elements is most metallic ?


15) The substance used in smoke is


16) The number pf P - O - P bridges in the structure of phosphorus pentoxide and phosphorus trioxide are respectively


17) An example of neutral oxide is


18) Phosphide ion has the electronic structure similar to that of


19) Phosphine is not obtained by the reaction when


20) With respect to protonic acids, which of the following statement is correct ?


21) White phosphorus when boiled with strong solution of caustic soda produce


22) Phosphorus pentoxide finds use as


23) Which one of the following pentafluorides cannot be formed ?


24) Which element from group 15 gives most basic compound with hydrogen ?


25) Which of the following has least covalent P - H bond?


26) The oxyacid of phosphorus in which phosphorus has the lowest oxidation state is


27) The oxidation state of nitrogen is highest in


28) When ammonia is heated with cupric oxide, a molecule of ammonia will


29) The three important oxidation states of phosphorus are


30) Nitrogen shows different oxidation states in the range.


31) Which of the following is arranged in the increasing order of enthalpy of vaporization ?


32) Which of the following is not correct ?


33) Phosphine is prepared by the action of


34) Which of the following substance is used as fertilizer ?


35) The chemical formula for tartar emetic is


36) Which of the following phosphorus is most reactive ?


37) Which of the following species is isoelectronic with CO?


38) Which one of the following molecules will have unequal bond length ?


39) Which one has the lowest boiling point?


40) Sodium hexametaphosphate is known as


41) The reduction of calcined phosphate rock with coke and sand in an electric arc furnace at 1773 K gives a number of products including


42) What are the product obtained when ammonia reacted with excess chlorine?


43) The most stable hydride is


44) Which of the following is a tetrabasic acid ?


45) Metaphosphoric acid has the formula ?


46) Basicity of orthophosphoric acid is


47) The oxide which is the anhydride of orthophosphoric acid is


48) At. No. of N is 7, the at. no. of the third member of nitrogen family will be


49) The structural formula of hypophosphorous acid is


50) Which of the following is an ionic compound ?


51) The NO molecule


52) Which among the following is a deliquescent ionic solid ?


53) Which of the following catalysts is commonly employed in the manufacture of ammonia by the Haber's process ?


54) A solution of sodium in liquid ammonia is blue due to the presence of


55) Which of the following molecule is stable, not hydrolysed by water, and has little tendency to act as a donor ?


56) By reacting with which of the following reagents does ammonia produce a brown precipitate ?


57) Which of the following allotropic forms of phosphorus is the most stable, least reactive has a graphite-like structure, and is good conductor of electricity ?


58) Among the following molecule, which contain the maximum number of P - H bonds ?


59) Which of the following oxides of nitrogen is a mixed anhydride of two acids ?


60) Which of the following statement is incorrect for nitric oxide ?


61) Which among the following is the least basic ?


62) Which of the following compound does not produce ammonia on heating ?


63) Ammonia gas is dried over


64) The number of P-O-P bonds in cyclic metaphosphoric acid is


65) Laughing gas is


66) The chemical used for cooling in refrigeration is


67) Nitrogen is essential constituent of all


68) Which of the following statement is not correct for nitrogen ?


69) Which acts both as an oxidizing as well as reducing agent ?


70) Which of the following can be used as an anaesthetic ?


71) The shape of ammonia molecule is


72) The aqueous solution/liquid that absorbs nitric oxide to a considerable extent is


73) When ammonia nitrate is gently heated , an oxide of nitrogen is formed. What is the oxidation state of nitrogen in this oxide ?


74) Which of the following not correct ?


75) Which one of the following nitrogen oxides is the anhydride of nitrous acid ?


76) Of the following which is paramagnetic and has three electron bond in its structure ?


77) Nitrous oxide is


78) One of the oxidants used with liquid propellants is


79) Which one of the following is used in the industrial preparation of nitric acid by Ostwald's process ?


80) Concentrated nitric acid oxidized phosphorus to


81) Nitrogen dioxide


82) Red P can be obtained from white P by


83) Phosphine is produced by adding water to


84) The number of hydroxyl groups in pyrophosphoric acid is


85) Which oxide does not act as a reducing agent ?


86) Which of the following is paramagnetic ?


87) The P-P-P bond angle in white phosphorus is


88) Which of the following fluorides does not exist ?


89) When ammonia is passed over heated copper oxide , the metallic copper is obtained. The reaction show that ammonia is


90) The correct sequence of decrease in the bond angle of the following hydrides is


91) Which is most explosive ?


92) The stability of the hydrides follows the order


93) Among the trihalides of nitrogen which one is most basic ?


94) Which of the following is a cyclic phosphate ?


95) The acid which forms two series of salts is


96) Which of the following has highest dipole moment ?


97) Which of the following is metaphosphoric acid ?


98) Which of the following non-metal possesses the atomicity half that of sulphur ?


99) P-O-P bond is present in


100) Which one of the following substance has the highest proton affinity ?


101) What may be expected to happen when phosphine gas is mixed with chlorine gas ?


102) Which of the following oxide of nitrogen is coloured gas ?


103) The lighting in the atmosphere causes the formation of


104) Nitrogen is liberated by the thermal decomposition of only


105) On heating ammonium dichromate, the gas evolved is


106) One mole of calcium phosphide on reaction with excess of water gives


107) Nitrates of all metals are


108) Oxidation state of phosphorus varies from


109) The largest bond angle is in


110) Slow acting nitrogenous fertilizer among the following is


111) Liquid ammonia is used in refrigeration because of its


112) Bone black is a polymorphic form of


113) Which of the following oxy acids of phosphorus is a reducing agent and monobasic ?


114) When tin is treated with concentrated nitric acid


115) The number of hydrogen atom(s) attached to phosphorus atom in hypophosporus acid is


116) Regular use of the following fertilizers increase the acidity of the soil ?


117) The nitrogen oxide(s) that contains N - N bond(s) is(are)


118) Ozone is not


119) Which of the following oxides is a peroxide ?


120) Polyanion formation is maximum in


121) Acidified solution of sodium thisulphate are unstable because in thiosulphate


122) Which is an oxidizing agent amongst the following


123) Which of the following bonds has highest energy ?


124) Which is most acidic in nature ?


125) All the element of oxygen family are


126) Which of the following hydrides is most acidic ?


127) Which is the best oxidizing agent among the following ?


128) A group 16 element exists in monoatomic state in the metallic lattice. It also exists in two crystalline forms. The metal is


129) Oxygen molecule is


130) Which of the following causes damage to the building containing calcium and responsible for cough and choking in human?


131) Which of the following is an oxoacid ?


132) Which of the following is incorrect?


133) Photoconductors of xerox machine uses


134) Bond angle is minimum for


135) Sulphur molecule is


136) Ozone belong to which group of the periodic table ?


137) Identify the incorrect statement with respect to ozone.


138) Electron affinity of sulphur is


139) The number of electron that are paired in oxygen molecule are


140) Oxidation state of oxygen is zero in


141) There is S-S bond in


142) Iron sulphide is heated in air to form A , an oxide of sulphur. A is dissolved in water to give an acid. The basicity of this acid is .........


143) The manufacturing of sulphuric acid by the contact process involves the catalyst


144) Which of the following is acidic ?


145) Which of the following formula represent the fuming sulphuric acid (oleum) ?


146) Which of the following properties is not correct for ozone ?


147) Crystalline form of sulphur stable at room temperature is


148) The element which has a simple cubic lattice in solid state is


149) Which shows maximum catenation property ?


150) Which of the following oxides reacts with HCl and NaOH ?


151) Permonosulphuric acid is known as


152) The metal with highest electrical resistance at room temperature is


153) The compound containing coordinate bond is


154) The compound of sulphur that can be used as refrigerant is


155) Which would quickly absorb oxygen ?


156) Which of the following behaves as both oxidising and reducing agent ?


157) Which of the following is formed by the action of water on sodium peroxide ?


158) Which of the following is not tetrahedral ?


159) Which of the following is not linear ?


160) Oleum is


161) Oxygen will directly react with each of the following element except.


162) What is the product formed when ozone reacts with mercury ?


163) Ozone is formed in the upper atmosphere from oxygen by the action of


164) An example of a neutral oxide is


165) Atomicity of sulphur in rhombic sulphur is


166) Which of the following species is basic and reducing ?


167) Which of the following oxoacids of sulphur contain sulphur -sluphur double bond ?


168) Which of the following molecule exists as a cyclic trimer in the solid state ?


169) The number of S-S bonds in the cyclic trimer of sulphur trioxide is


170) Which of the following acids is not a peroxo acid ?


171) Elements of group 16 (except polonium) are called chalcogens because


172) Which of the following statement is correct ?


173) The oxidation number of sulphur i the cyclic trimer of sulphur trioxide is


174) The acid used in lead storage cells is


175) Which of the following has the highest dipole moment ?


176) The type of hybridization in water molecule is


177) Which of the following has the least bond angle?


178) The number of unpaired electron in the p-subshell of oxygen atom


179) Which has maximum number of oxo group ?


180) Which of the following has the largest ionic size ?


181) Which of the following isoelectronic ions has the lowest ionization energy ?


182) Which of the following hydrides has the lowest boiling point ?


183) The number of dative bonds in sulphuric acid molecule is


184) Oleum is chemically known as


185) In the manufacturing of sulphuric acid by contact process, tyndall box is used to


186) A colourless gas with smell of rotten fish is


187) In which of the following, the oxidation number of sulphur is -1 ?


188) Structure of thiosulphuric acid is


189) The structure of the tetrathionate ion is


190) The structure of dithionate ion is


191) The structure of oleum is


192) All the following decompose easily on heating to give oxygen except


193) Sulphuric has great affinity for water because


194) When a colourless gas is passed through bromine water only decolourisation takes place. The gas is


195) Which of the following is not a reducing agent ?


196) Of the following set which one does not contain isoelectronic species ?


197) Which one of the following is an amphoteric oxide ?


198) A gas which cannot be collected over water is


199) The compound which gives off oxygen on moderate heating is


200) The first ionization potential in electron volts of nitrogen and oxygen atoms are respectively given by


201) Hydrolysis of one mole of peroxodisulphuric acid produces


202) The acid having O-O bond is


203) There is no S-S bond in


204) Which shows polymorphisum ?


205) Number of bonds in sulphuric dioxide is


206) Caro's acid is


207) Sulphur in +3 oxidation state is present in


208) Which of the following is monoatomic ?


209) Noble gases do not react with other element because


210) Least chemical activity is shown by


211) Which of the following fluorides of xenon is impossible ?


212) Which of the following has zero valency?


213) A clathrate may be defined as a


214) The most abundant noble gas found in atmosphere is


215) The last member of the family of inert gases is


216) Which of the following is the correct sequence of the noble gases in their group in the period table?


217) The element which occupy the peaks of ionization energy curve are


218) The noble gas lighter than air is


219) Which of the following two are isostructural ?


220) Noble gases are a group of element which exhibit very


221) Which one of the following is correct pair with respect to molecular formula of xenon compound and hybridization state of xenon in it?


222) Argon was discovered by


223) Which of the following is not correct ?


224) Which of the following outer electronic configuration represent argon ?


225) The spectrum of helium is expected to be similar to that of


226) Percentage of Ar in air is about


227) Which of the following statement is not true about noble gases ?


228) Number of unpaired electron in inert gas is


229) Which of the following cannot be formed ?


230) The lowest boiling point of helium is due to its


231) What are the products formed in the reaction of xenon hexafluoride with silicon dioxide ?


232) The correct order of solubility in water for He, Ne, Ar, Kr and Xe is


233) If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume takes place, the volume finally obtained would be approximately


234) The density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by a chemical reaction from a compound of nitrogen due to the presence of the following in aerial nitrogen


235) The atomic mass of noble gases is determined with the help of the following relationship


236) The forces acting between noble gas atoms are


237) Which of the following statement about noble gases is false ?


238) The noble gas forming maximum number of compounds in


239) In the following four element, the ionization potential of which one is the highest ?


240) Sea divers go deep in the sea water with a mixture of which of the following gases?


241) The coloured discharge tubes for advertisement mainly contain


242) Which one of the following element is most reactive ?


243) What is the atomic number (Z) of the noble gas that reacts with fluorine ?


244) Which noble gas is most soluble in water ?


245) Which of the following noble gas has highest polarizability ?


246) Which of the following is an inert gas ?


247) In the clathrates of xenon with water, the nature of bonding between xenon and water molecule is


248) Which element out of He, Ar, Kr and Xe forms least number of compound?


249) Which is a planar molecule?


250) The fluoride of xenon with zero dipole moment is


251) Which of the following noble gases is the least polarized ?


252) Noble gases are difficult to liquefy because their


253) Which of the following statement is incorrect ?


254) Helium is suitable for low temperature gas thermometry because of its


255) Which of the following is superfluid ?


256) The noble gas which forms interstitial compound with metals is


257) The noble gas commonly used in cryogenic study is


258) Which of the following noble gas is radioactive in nature ?


259) Which species is not known ?


260) Noble gases can be separated by


261) Xenon best reacts with


262) The compound that attacks pyrex glass is


263) Noble gases do not occur in


264) Liquid flow from a higher to a lower level. Which of the following liquid can climb up the wall of the glass vessel in which it is placed ?


265) The ease of liquefaction of noble gases decrease in the order


266) B.p.t and m.p.t of inert gases are


267) Which statement is correct ?


268) Helium-oxygen is mixture used by deep sea divers in preference to nitrogen-oxygen mixture because


269) Among the noble gases (From He to Xe) only xenon reacts with fluorine to form stable xenon fluorides because xenon


270) The value of ionization potential for inert gases is


271) The noble gas was first time discovered by


272) Which of the following noble gases is not present in atmosphere ?


273) Which of the following statement is not correct for a noble gas?


274) Which of the following noble gases does not have an octet of electron in its outermost shell?


275) Gradual addition of electronic shell in the noble gases causes a decrease in their


276) The noble gas which was discovered first in the sun and then on the earth


277) In which of the following groups, when helium is placed, all its properties are satisfied ?


278) Which one of the following statement regarding helium is incorrect?


279) Asthma patients use a mixture of ....... for respiration


280) Which one of the following reactions of xenon compounds not feasible?


281) Sea weeds are important source of


282) Bromine is obtained on a commercial scale from


283) In which of the following, oxygen has +2 oxidation number


284) Bad conductor of electricity is


285) Which of the following is the strongest oxidizing agent?


286) Iodine readily dissolves in potassium iodine solution giving


287) Hydrogen fluoride is liquid unlike other hydrogen halides because


288) Oxidizing action increases in the following order


289) Which has the highest molar heat of vaporization?


290) Which of the following bonds will be most polar?


291) Which one of the following can be purified by sublimation?


292) Hydrogen bonding does not play any role in boiling of


293) Which one of the following sequences represents the correct increasing order of bond angles in the given molecules?


294) Which one of the following elements can have both positive and negative oxidation state?


295) The element which never acts as a reducing agent in a chemical reaction is


296) The aqueous solution of which of the following has maximum pH?


297) Which of the following represents calcium chlorite?


298) The correct order of reactivity of halogens with alkalies in


299) Which of the following reaction involves oxidation and reduction?


300) The halogen that is most easily reduced is


301) At room temperature, HCl is a gas while HF is a low boiling liquid. This is because


302) Hydrogen bond is strongest in


303) For electron affinity of halogens which of the following is correct?


304) Which one of the following statements about halogens is correct?


305) The isoelectronic pair is


306) Mark the smallest atom.


307) Iodine deficiency in diet is known to cause


308) Bleaching powder is obtained by the action of chlorine gas and


309) Which halogen is the most electrospositive?


310) Bleaching powder reacts with a few drops of conc. HCl to give


311) Correct order of the size of iodine species is


312) Which of the following arrangement for the three halogens Cl, Br and I when placed in the order of their increasing electron affinity is correct?


313) Which statement is correct about halogens?


314) Elements of which of the following groups will form anions most readily?


315) The correct sequence of arrangement of the following compounds in order of decreasing oxidation numbers of iodine is


316) Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound?


317) Which of the following is most basic?


318) Which one of the following oxyacids of chlorine is the least oxidizing in nature?


319) Which is the weakest acid out of HF, HCl, HBr and HI?


320) Which of the following cannot work as oxidising agent?


321) Chlorine is liberated when we heat


322) Which of the following is used in the preparation of chlorine?


323) Freon is used as a


324) Which of the following is incorrect with respect to property indicated?


325) Which of the following elements shows different oxidation states?


326) What is the oxidation state of chlorine in hypochlorous acid?


327) Which one of the following halogen liberates oxygen, when passed through hot concentrated KOH solution?


328) "Fluorosis" disease is caused due to the reaction of ........ With excess of fluoride in the body


329) The set with correct order of acidity is


330) Iodine can exist in the oxidation states


331) Which one of the halogen acid is a liquid?


332) Euchlorine is a mixture of


333) Which of the following halogen oxides is ionic?


334) Which of the following is a false statement?


335) The bleaching action of chlorine is due to


336) Strongest hydrogen bonding is shown by


337) Which of the following sets has strongest tendency to form anions?


338) Charge distribution in iodine mono-chloride is best represented as


339) Which among the following is paramagnetic?


340) Which of the following is not the characteristic of interhalogen compounds?


341) Which of the following halogen does not exhibit positive oxidation state in its compounds?


342) Which bond is most polar?


343) Which of the following sets gives the correct arrangement of the compounds involved based on their bond strengths?


344) Which of the following elements exhibits the most basic properties?


345) Dilute hydrochloric acid solution cannot be concentrated by boiling beyond


346) The compounds used as gaseous insulators in high voltage generators is


347) Which of the following acid is weakest?


348) Which one of the following is the true covalent oxide of iodine?


349) As the atomic number of halogens increases, the halogens


350) The type of bonding in HCl molecule is


351) Which of the following species has four lone pairs of electrons?


352) When chlorine is passed over dry slaked lime at room temperature, the main reaction product is


353) A solution of potassium bromide is treated with each of the following. Which one would liberate bromine?


354) An element has an atomic mass 19 and atomic number 9. Its ion is represented by


355) Fluorine does not show positive oxidation states due to the absence of


356) Electrolysis of brine produces


357) Which of the following compounds is the strongest fluorideion acceptor?


358) Which of the following is arranged in order of increasing ionic character?


359) Which of the following statements is correct?


360) Which of the following interhalogens does not exist?


361) Which of the following statements is correct?


362) Certain ions, with properties similar to halide ions, have two or more atoms of which at least one is nitrogen. Such ions are called


363) Which of the following is not a pseudohalide ion?


364) Chlorine can be manufactured by the oxidation of HCl in air by


365) The ionic character of the metal-halogen bond (M - X) in metal halides decreases in the order


366) Hydrofluoric acid cannot be stored in glass vessels because it reacts with glass to form


367) Which of the following shows the arrangement of halide ions in increasing order of reducing property?


368) Which of the following is not linear?


369) Which of the following has greatest reducing power?


370) Which of the following halogens does not from oxyacids?


371) Which of the following pairs is not correctly matched?


372) Chlorine cannot displace


373) Unlike other halogens, fluorine does not show higher oxidation states because


374) Which of the following belongs to the halogen family?


375) Fluorine is a stronger oxidizing agent than chlorine in aqueous solution. This is attributed to many factors except


376) Which of the following halogens has metallic character?


377) Among F, Cl, Br, and I the lowest ionization potential will be of


378) The electronegativity follows the order


379) The electron affinity of the halogens follows the order


380) The one with the largest size is


381) Which of the following is the strongest acid?


382) Halogen which can be prepared from caliche is


383) Among the halogens, the one which is oxidized by nitric acid is


384) A greenish yellow gas reacts with an alkali metal hydroxide to form a halite which can be used in fire works and safety matches. The gas and halite respectively are


385) Which of the following is used as an antiseptic?


386) Which of the following pairs will give chlorine gas most quickly upon reaction?


387) Which of the following is most volatile?


388) Which of the following has the stronger bond?


389) Which has the highest bond energy?


390) Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that


391) The correct order of the thermal stability of hydrogen halides (H - X) is


392) Which of the following is most stable to heat?


393) Chlorine acts as bleaching agent only in presence of


394) Bromine can be liberated from potassium bromide solution by the action of


395) Which of the following is the strongest acid?


396) The element which exist/s in the liquid state is / are


397) The halogen which is most easily reduced is


398) Which one of the following species is not a pseudohalide?


399) The correct order of acidic strength is


400) Which species has the maximum number of lone pair of electrons on the central atom?


401) Identify the incorrect statement among the following.


402) Increasing order of acid strength of halogen acid is


403) Solubility of iodine in water may be increased by adding


404) The correct order of pseudohalide, polyhalide and interhalogen are


405) Which can do glass etching?


406) Which is strongest acid?


407) What products are expected from the disproportionation reaction of hypochlorous acid?


408) Which one of the following configuration represents a noble gas?


409) Which halogen do not form polyhalide ion?


410) Oxygen is manufactured by fractional distillation of:


411) Which is not the property of nitrogen?


412) Which metal loses its meniscus after reaction with ozone?


413) The two electrons in helium atom:


414) Which of the following is not tetrahedral?


415) Clathrates are


416) Two pungent smelling gases bleach a certain substance. The gases may be:


417) NaOH can absorb :


418) Nitrogen is an essential constituent of all:


419) The electron affinity of halogens shows the order:


420) Mark the halogen which shows electropositive character:


421) On heating ozone its volumes:


422) Which of the following is called Berthelot's salt?


423) A compound which leaves behind no residue on heating is:


424) Phosphine on reaction with hydrobromic acid gives:


425) Bleaching powder has the molecular formula:


426) Which of the following is pseudohalogen?


427) Six volumes of oxygen, on complete ozonisation, form …. Volumes of ozone.


428) The decreasing order of b.p. or m.p. of halogens is:


429) Ozonization of water is carried out to remove:


430) Iodine solution stained on clothes can be removed by:


431) Nitrogen (I) oxide is produced by:


432) Welding of magnesium can be done in an atmosphere of


433) Which noble gas is not found in atmosphere?


434) An inorganic compound producing organic compound on heating is:


435) The substance which does not liberate oxygen on treatment with ozone is


436) Formula of calcium chlorite is:


437) The gas not absorbed by coconut charcoal is


438) Lead nitrate on heating gives lead oxide, nitrogen dioxide and oxygen. The reaction is known as:


439) A black sulphide when treated with ozone becomes white. The white compound is:


440) Which hydride is the strongest base?


441) Which forms maximum compounds with xenon?


442) Claude's process is used in the manufacture of:


443) Sulphur on oxidation with hot sulphuric acid gives:


444) Which is a saline oxide?


445) Which set of elements has the strong tendency to form anions?


446) Which loses weight on exposure to the atmosphere?


447) The correct order of heat of formation of halogen acids is?


448) Light blue colour of nitrous acid is due to dissolved:


449) The number of P-O-P bridges in the structure of phosphorus pentoxide and phosphorus trioxide are respectively


450) Rhombic and monoclinic sulphur are:


451) Which one of the following pairs of reactants does not form oxygen when they react with each other?


452) Oxide of a non-metal possesses the following characteristics:
(i) It is both a proton donor and proton acceptor.
(ii) It is poor conductor of electricity.
(iii) It reacts readily with basic and acidic oxides.
(iv) It oxidses Fe at boiling point.
The oxide is:


453) Which of the following is a metalloid?


454) Which of the following is more acidic in nature?


455) The weakest acid is


456) Most unstable hydride is


457) Which element is most metallic?


458) Concentrated nitric acid reacts with iodine to give:


459) Phosphide ion has the electronic structure similar to that of:


460) Electron affinity for a noble gas is approximately equal to:


461) The gaseous mixture used by deep sea divers for respiration is:


462) A gas that cannot be collected over water is


463) Which is used in the manufacture of safe matchsticks?


464) Which of the following is not hydrolysed?


465) The m. p. and b. p. is lowest for:


466) Chlorine, bromine and iodine are placed in the seventh group of the periodic table because:


467) Nitric acid whether diluted or concentrated:


468) An element belongs to group 15 and third period of the periodic table. Its electronic configuration will be


469) The number of p-electrons in bromine atom is:


470) The reagent used for testing ammonia is:


471) Which species has the largest dipole moment?


472) Elements of nitrogen family having allotropic forms are:


473) An example of tetrabasic acid is:


474) Nitrogen can be purified from the impurities of oxides of nitrogen and ammonia by passing through:


475) Which statement is correct?


476) Calcium phosphide is:


477) Phosphoric acid is syrupy liquid due to:


478) Which of the following inert gas liquefies easily?


479) Nitric acid may be kept in a bottle of:


480) Which is not poisonous?


481) In sulphate ion the oxidation state of sulphur is +6 and the hybridization state of sulphur is:


482) The least stable hydride of 15th group elements is


483) Which of the light effective in the formation of chlorophyll?


484) Which of the following is an explosive compound?


485) The element evolving two different gases on reaction with conc. Sulphuric acid is


486) Which statement is correct?


487) The noble gas which forms maximum number of compounds is


488) The most abundant element in the earth crust is


489) Blasting of TNT is done by mixing it with:


490) Man dies, when nitrous oxide is inhaled in large quantities because it:


491) The most reactive allotropic form of phosphorus is:


492) Nitrogen gas is absorbed by:


493) The strongest acid amongst the following is


494) ….. liberates oxygen from water.


495) The hydroxide of which metal is soluble in excess of ammonia:


496) Which group is called buffer group of the periodic table?


497) Gradual addition of electronic shells in the noble gases causes a decrease in their


498) Sodium pyrophosphate is represented by which of the following formula?


499) Colour of iodine solution is disappeared by shaking it with aqueous solution of


500) S—S bond is not present in


501) Sequence of acidic character is:


502) Phosphorus is manufactured by heating …… in a furnace.


503) A radioactive element is:


504) Which of the following(s) when heated give nitrogen gas?


505) Metalloid among the following is:


506) Which oxide of nitrogen is coloured gas?


507) Ozone is readily dissolved in:


508) The basic character of hydrides of the V-group elements decreases in the order


509) Consider the following compounds:
1. Sulphur dioxide
2. Hydrogen peroxide
3. Ozone
Among these compounds identify those that can act as bleaching agent.


510) Different allotropic forms of sulphur differ in:


511) Phosphorus compound used as drying agent and desiccating agent is:


512) Monoatomic element of nitrogen family is:


513) Which noble gas was first of all detected in solar chromosphere?


514) How many bonding electron pairs are there in white phosphorus?


515) Which of the following does not react with fluorine?


516) Which of the following causes damage to the building containing calcium and responsible for cough and choking in human?


517) The acid used in lead storage battery is:


518) Halogen used in the preparation of insecticides is:


519) Which halogen acid is a liquid?


520) Halon-1301 is


521) The pair of species having identical shape for molecules of both species is


522) Which molecule does not possess distorted geometry?


523) Iodine displaces chlorine from which one of the compounds?


524) Which member of oxygen family has the highest catenation ability?


525) The noble gas used in the preparation of first noble gas compound was:


526) On heating ammonium dichromate, the gas evolved is:


527) Regular use of which of the following fertilizers increases the acidity of soil?


528) Nitric oxide is:


529) Mark the wrong statement. Halogens are all coloured.


530) Which reaction can be used to prepare phosphoric acid?


531) The last member of inert gas family is:


532) Which gas is filled in electric bulbs/tubes?


533) Helium–oxygen mixture is used by deep by sea divers in preference to nitrogen oxygen mixture because


534) Iodine is formed when potassium iodide reacts with a solution of


535) Among the fluorides below, the one which does not exist is


536) The percentage of nitrogen in air remains almost constant due to:


537) The bleaching action of bleaching powder is due to


538) Which noble gas has highest and least polarisability respectively?


539) The metal which does not form ammonium nitrate by reaction with dilute nitric acid is


540) Nitrolim, a nitrogeneous fertilizer, is:


541) The deficiency of iodine in diet causes


542) The number of P-O-P bonds in cyclic metaphosphoric acid is


543) Which noble gas is more soluble in water?


544) Liquid oxygen is:


545) Which statement about noble gases is not correct?


546) Noble gases are group of elements which exhibit very


547) Ozone reacts with:


548) The inert gas abundantly found in atmosphere is


549) The reaction of chlorine with CO in the presence of sunlight gives:


550) The mixture of noble gases is separated by:


551) The boiling points of halogens increase with increase in molecular weight, it is because:


552) The strongest oxidizing agent is:


553) Increasing order of acid strengths of hydrogen halides is:


554) Noble gases are sparingly soluble in water due to


555) Which is monoatomic?


556) Oxidation state exhibited by sulphur


557) Which gas can be collected over water?


558) The gases absorbed by alkaline pyrogallol and oil of turpentine respectively are:


559) Ozone turns tetramethyl base paper:


560) Aquaregia is a mixture of:


561) Statement 1 : Helium is the only substance that can't be solidified at atmospheric pressure.
Statement 2 : The zero point energy of helium is very high.


562) Statement 1 : The van der Waals' forces are directly proportional to the ionisation potentials.
Statement 2 : Van der Waals' forces increases as the size and diffuseness of the electron clouds increases.


563) Number of hydroxyl groups present in pyrosulphuric acid is


564) Statement 1 : Red phosphorus is less volatile than white phosphorus.
Statement 2 : Red phosphorus has a discrete tetrahedral structure.


565) Which is not an acid salt?


566) Statement 1 : The ionization energy of gallium remains nearly same as that of aluminium.
Statement 2 : This is due to shielding of outer shell electrons form the nucleus by the d electrons of gallium.


567) In fisher-Ringe's method of separation of noble gas mixture from air, ………. Is used.


568) A colourless gas on passing through bromine water decolourises it. The gas is:


569) In the manufacture of sulphuric acid by contact process, tyndall box is used to


570) The oxide insoluble in water is:


571) Which indicates the common laboratory method for the preparation of chlorine?


572) Chlorine acts as a bleaching agent only is presence of


573) Which one of the following pentafluorides cannot be formed?


574) Which of the following has highest proton affinity?


575) Nuclear fusion produces:


576) Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that


577) In the dewar's method of separation of noble gases, the mixture of noble gases is kept in contact with coconut charcoal at 173 k . Which one of the following gaseous mixtures is not adsorbed on to the charcoal?


578) The X—X bond dissociation energy is minimum in:


579) Which is soluble in water?


580) The oxidation state of N is highest in:


581) Formula of rhombic Sulphur is:


582) The noble gases are unreactive because they:


583) Phosphine reacts with copper sulphate solution to form:


584) Desicchlora is


585) Who among the following first prepared a stable compound of noble gas?


586) Colour of iodine solution can be discharged by shaking it with aqueous solution of:


587) Which of the following is called stranger gas?


588) Sulphuric acid has great affinity for water because


589) Major credit for the discovery of noble gases is given to:


590) Noble gases possess:


591) What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?


592) A green yellow gas reacts with an alkali metal hydroxide to form a halate which can used in fireworks and safety matches. The gas and halate respectively are


593) When plants and animals decay, the organic nitrogen is converted into inorganic nitrogen


594) Which of the following species is not a pseudohalide?


595) Sulphur is soluble in:


596) Which of the following is formed by xenon?


597) The oxide which is solid at room temperature is:


598) Which hydride possesses the maximum complex forming nature?


599) Bad conductor of electricity is:


600) The van der Waals' forces in halogens decrease in the order:


601) With cold and dilute sodium hydroxide fluorine reacts to give


602) Which hydride does not exist?


603) Ozone is formed by the interaction of water with:


604) Which reaction is not valid?


605) The lattice energy of lithium halides in the following order


606) Iodine readily dissolves in potassium iodide solution giving


607) Which one of the following is not true at room temperature and pressure?


608) Which of the following acid posses oxidising, reducing and complex forming properties?


609) Ammonium chloride is removed from its mixture by:


610) White smoke is formed when ammonia gas meets with:


611) Liquid ammonia is used in refrigeration because of its


612) The acid used in soft drinks is:


613) Which of the elements of group VA does not show allotropy?


614) In the electrothermal process, the compound displaced by silica from calcium phosphate is


615) It is possible to obtain oxygen from air by fractional distillation because:


616) Among the halogens, the one which is oxidized by nitric acid is


617) Which is most basic of the following oxides?


618) Which is stronger acid?


619) Ammonia on reaction with hypochlorite anion, can form


620) Which of the following compounds do not exist?


621) Oxidation of ammonia by CuO yields:


622) The correct order for decreasing acidic strength of oxoacids of gp.15 is:


623) For chrome plating the electrolytic bath contains:


624) Chlorine gas can be dried by passing over:


625) Which of the following bonds will be most polar?


626) At T (K), 100 L of dry oxygen is present in a sealed container. It is subjeceted to silent electric discharge, till the volumes of oxygen and ozone becomes equal .what is the volume of ozone formed at T (K)?


627) What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr?


628) The source of most of the noble gases is:


629) Paramagnetic oxide of chlorine is :


630) Pure HBr gas may be obtained by heating sodium bromide with syrupy phosphoric acid and not with concentrated sulphuric acid because concentrated sulphuric acid is:


631) Fertilizer having the highest nitrogen percentage is:


632) The first noble gas compound obtained was:


633) Which one of the following represents noble gas configuration?


634) There is no S−S bond is


635) Sulphurous acid can be used as:


636) The ease of liquefaction of noble gases decreases in the order:


637) Decreasing order of reducing power of hydrogen halides is :


638) Which one of the following reacts with glass?


639) Super halogen is:


640) The gas which is supporter of combustion is:


641) The halide that cannot act as Lewis acid is:


642) Which gives off oxygen on moderate heating?


643) Which is the true covalent oxide of iodine?


644) Which element out of He, Ar, Kr and Xe forms least number of compounds?


645) Nitrogen does not combine directly with:


646) Which of the following is the strongest oxidizing agent?


647) Approximately what percentage of air by volume gets used in a process of combustion?


648) In case of halogen family, which trend occurs as the atomic number increases?


649) What is the product formed when phosphorus trioxide is dissolved in water?


650) Xenon directly combines with:


651) The last orbit of argon would have electrons


652) Phosphine is not evolved when:


653) The acidic nature of HF can be increased in presence of:


654) Identify the incorrect statement among the following :


655) Which of the following oxides are acidic?


656) The pentavalence in phosphorus is more stable as compared to that of nitrogen even though they belong to the same group. It is due to


657) With excess of chlorine, ammonia forms:


658) Which of the following is kept in water?


659) The formula of iodine acetate is:


660) The anhydride of hypochlorous acid is:


661) Anhydrone is:


662) Thermal stability of hydrogen halide follows the order:


663) The correct order of boiling points of the hydrides of nitrogen family is


664) In which process sulphur is not used?


665) When the mineral clevite is heated, it give off the inert gas


666) Iodine is fromed when KI reacts with solution of


667) Used as desiccant.


668) Oxygen is not readily reacted with


669) The strongest reducing agent among the following is


670) Most acidic oxide among the following is


671) Which one has the highest bond energy?


672) Liquid flow from a higher to a lower level. Which of the following liquids can climb up the wall of the glass
vessel in which it is placed?


673) Pure nitrogen can be prepared from


674) Fluorine can be free from HF by passing the mixture through:


675) Which of the following noble gases is most reactive?


676) Fluorine is usually obtained from:


677) First stable compound of inert gas was prepared by:


678) Mark the strongest acid


679) Which is incorrect for bleaching powder?


680) The strongest acidic oxide is:


681) The most basic hydride is


682) Phosphorus pentoxide cannot be used to dry:


683) Apatite is an ore of


684) Calcium cyanamide on treatment with steam produces


685) A hydride of nitrogen having lowest oxidation number of N:


686) Copper turnings when heated with concentrated sulphuric acid will give


687) Chlorine acts as a bleaching agent only in presence of


688) Swimming pools are disinfected by bubbling through water with a controlled quantity of:


689) Chlorine water on cooling deposits greenish-yellow crystals of:


690) Which inert gas have highest boiling point?


691) A glass tube containing molten antimony breaks upon solidification of antimony due to:


692) Metaphosphoric acid is


693) Which one of the following statements regarding helium is incorrect?


694) Hydrogen bromide is dried by passing the gas through:


695) By warming a paste of bleaching powder with a solution of ammonia, we get:


696) The ion that cannot undergo disproportionation is:


697) Which of the following is the most basic oxide?


698) Phosphine is generally prepared in the laboratory?


699) The correct order of acidic nature is:


700) The most abundant inert gas in air is:


701) The van der Waal’s forces are the greatest in:


702) Which of the following hydrogen halides has the highest boiling point?


703) Starch paper moistened with KI solution turns blue in ozone because of:


704) Which of the following statement is not true?


705) In which of the following chlorine is not used:


706) The molecular formula of dithionic acid is


707) Solubility of iodine in water may be increased by adding


708) Platinum, palladium and iridium are called noble metals because


709) Bleaching powder is disinfectant for purification of water. When water born germs are killed. But disinfectant activity is destroyed. It is due to disproportion into


710) Marshall's acid is:


711) The correct order of pseudohalide ,polyhalide and interhalogen are


712) The word neon signifies:


713) Paramagnetic oxide is:


714) Fluorosis disease is caused due to the reaction of …….. with excess of fluorine in the body.


715) Which one is correct statement?


716) Among the halogens, the one which is oxidised by nitric acid is


717) Which has the lowest boiling point?


718) The elements S, Se, Te can have two positive oxidation states. Which one of the following is correct?


719) Which sulphide is used in the manufacture of "strike anywhere" matches?


720) Liquid oxygen:


721) The substance which is solid at room temperature forms ionic compounds and reacts with hydrogen forming a hydride, the aqueous solution of which is acidic, could be


722) Oxide of nitrogen which is soluble in alcohol is:


723) Ammonia water is a good cleaning agent because it:


724) A clathrate is defined as a:


725) The correct order of reducing abilities of hydrides of V group elements is


726) Available chlorine is liberated from bleaching powder when it:


727) Ordinary oxygen contains:


728) A salt of sulphurous acid is called:


729) Metal halide which is insoluble in water is


730) Chlorine bleaches only in the:


731) The sides of safety matches contains


732) Phosphine is:


733) The P-P-P bond angle in white phosphorus is


734) Antimony dissolves in aquaregia to give:


735) In the isolation of fluorine, a number of difficulties were encountered. Which statement is correct?


736) The most stable hydride is


737) Thomas slag is:


738) Dinitrogen pentoxide a colourless solid is prepared by


739) Which of the following elements is radioactive?


740) Ammonium compound not used as a fertilizer is:


741) Which one of the following reactions of Xenon compounds is not feasible?


742) Javelle water is:


743) Which one is most electronegative?


744) The strongest acid is:


745) Orthophosphoric acid on heating gives:


746) The largest bond angle exists in:


747) Increasing order of strength of oxo-acids of chlorine is:


748) Which oxide is more acidic?


749) The correct order of bond angles and stability of hydrides given below is:


750) Which oxide do not act as a reducing agent?


751) When chlorine reacts with dil. NaOH under cold conditions, the oxidation state of chlorine changes from zero to


752) Fuming sulphuric acid is


753) Yellow ammonium sulphide is:


754) The weakest acid is:


755) Sulphuric acid is used:


756) The smell of nitrogen dioxide is:


757) The gas obtained when urea reacts with nitrous acid is:


758) Halogen used as an antiseptic is:


759) Nitrous oxide


760) The species that does not contain peroxide ion is


761) The gas used for inflating the tyres of aeroplanes is:


762) Fluorapatite is a mineral of:


763) The element present in combined state in Laminaria stenophylla is:


764) Least malleable and ductile metal is:


765) Phosphine is prepared by the reaction of


766) In the manufacture of bromine from sea water, the mother liquor containing bromide is treated with


767) Which of the following does not react with AgCl?


768) Which of the following is not correct?


769) Which of the following equations is not correctly formulated?


770) Laughing gas is prepared by heating


771) A certain element forms a solid oxide which when dissolved in water forms an acidic solution. The element is:


772) Which statement is not correct for nitrogen?


773) The oxidizing property of nitric acid is due to:


774) Which of the following acts as fluoro Lewis acids?


775) The reaction showing endothermic nature and reduction of halogen is:


776) A radioactive element X decays to give two inert gases. X is:


777) Calcium carbide when heated with nitrogen forms:


778) Which one of the following can be purified by sublimation?


779) Hydrofluoric acid is not preserved in glass bottles because:


780) Ammonia is:


781) Schweitzer's reagent is:


782) Sulphur on boiling with NaOH solution gives


783) Which does not give oxygen on heating?


784) Correct order of decreasing thermal stability is as


785) Electronegativity of an inert gas is:


786) Most electropositive halogen is:


787) Good conductor of electricity is:


788) Which of the following pairs is obtained on heating ammonium dichromate?


789) Which of the following has S—S bond


790) Which burns to form an oxide which is gas at room temperature?


791) The crystals of ferrous sulphate on heating give:


792) Helium was discovered by:


793) The structure of orthophosphoric acid is


794) Which one of the following reactions does not occur?


795) Bleaching action of chlorine is due to:


796) In clatherates of xenon with water, the nature of bonding between xenon and water molecule is


797) Asthma patients use a mixture of…..for respiration.


798) Which is an amphoteric oxide?


799) Which requires catalyst?


800) Anhydride of nitric acid is:


801) Fluorine gas is stored in:


802) Which of the following is used in very low temperature thermometers?


803) Which of the following attacks glass:


804) The noble gas forming maximum number of compound is


805) Which property of white phosphorus is common to red P?


806) Which one of the following statements is not true?


807) Which one of the following pairs of substances when mixed, produces chlorine gas at room temperature?


808) Which of the following elements is good conductor of electricity?


809) Which of the following form of interhalogen compounds does not exists?


810) Which one is true peroxide?


811) When a colourless gas is passed through bromine water, decolourization takes place. The gas is:


812) Which reaction is not feasible?


813) The bonds present in pernitric acid are:


814) In which of these processes platinum is used as a catalyst?


815) A greenish yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fireworks and safety matches. The gas and halate respectively are:


816) Correct statement about white phosphorus is:


817) Ammonia reacts with excess of chlorine to form:


818) The noble gas which can diffuse through rubber and glass easily is


819) Sea-weeds are important sources of:


820) CAN pellets are coated with calcium silicate because:


821) Yellow phosphorus is kept in:


822) When silver chloride dissolves in ammonia, it forms?


823) Caro's acid is:


824) Which one of the following has lowest bond dissociation energy?


825) Ozone reacts with moist iodine giving:


826) On heating sodium as well as sulphur can be melted. Molten sodium and molten sulphur are used as:


827) Which of the following pairs has bleaching property?


828) Which of the following is not a hydride?


829) In froth floatation process for the purification of ores, the particles of ore float because


830) The zero group members are collectively known as:


831) Pnicogens are the elements of group?


832) The percentage of available chlorine in a commercial sample of bleaching powder is:


833) Which statement is false for ozone?


834) Which oxide of chlorine is most powerful oxidizing agent?


835) The electrolysis of brine solution to manufacture chlorine is carried out in the:


836) The correct order of acidic strength is:


837) Chlorous acid and its salts (chlorites) are:


838) Antimony burns in chlorine to form:


839) Ozone molecule has …….. geometry.


840) Bromargyrite is a mineral of:


841) Which is not true for ozone?


842) The strongest oxidizing agent is:


843) Helium is used in gas balloons instead of hydrogen because:


844) The oxidation states of phosphorus vary from:


845) Which of the following is a mixed anhydride?


846) The following elelment forms a molecule with eight of its own atoms


847) Which does not give ammonia with water?


848) Bond length is maximum in:


849) The correct order of acidic nature of oxides is in the order


850) Nitrogen molecule is chemically less active because it has a …… between two nitrogen atoms.


851) Sulphur trioxide is dissolved in heavy water to form a compound X. The hydridisation of sulphur in X is


852) Bleaching powder is mixed calcium salt of:


853) Which noble gas does not form clathrates?


854) Strongest reducing agent is:


855) Bleaching properties of bleaching powder are due to its:


856) One mole of calcium phosphide on reaction with excess water gives


857) Most abundant element in earth's crust is:


858) Which noble gas has the least tendency to form compounds?


859) Which reaction yields the greatest quantity of chlorine from a given quantity of hydrochloric acid?


860) Mixture used on tips of matchsticks is:


861) Superphosphate of lime is


862) In Birkeland and Eyde process, the temperature of the electric arc is about:


863) Which element shows polymorphism?


864) Select the correct statement.


865) When Zn reacts with very dilute nitric acid it produces?


866) Nitric acid is generally light yellow due to the presence of:


867) The inert gases present in atmosphere are:


868) Graham's salt is:


869) Orthophosphoric acid is ionized in…….steps.


870) Percentage of argon in air is about:


871) Select the incorrect statement among the following


872) Aqua fortis is:


873) Which among the following is the strongest acid?


874) Peroxy acids are


875) The pale-yellow coloured gas is:


876) What may be expected to happen, when phosphine gas is mixed with chlorine gas?


877) Which of the following is a pseudohalogen?


878) A substance X when heated with sulphuric acid liberates a gas which turns starch paper blue. The substance is:


879) The formula of zinc phosphite is:


880) How can you synthesise nitric oxide in the laboratory?


881) Uranium isotopes are usually separated by using compounds of the halogen:


882) By the action of concentrated hydrochloric acid on potassium chlorate we get this mixture of gases:


883) For advertisement the coloured dischared tubes contain


884) Which of the following halogen oxides is ionic?


885) Ammonium salts are oxidized in the soil to nitrites by:


886) Which reaction cannot be used for the preparation of the halogen acid?


887) The principal source of helium is:


888) Bleaching powder is a mixture of:


889) Which gas is used to improve the atmosphere of crowded places?


890) The chemical formula for tartar emetic is:


891) Which is an essential trace element involved in physiology of thyroid glands?


892) Iodine imparts brown colour to:


893) Which coagulates white of an egg?


894) Neon is extensively used in:


895) The fluoride which does not exist is:


896) Fluorine exhibits an oxidation state of only -1 because


897) The solubility of iodine in water increases in presence of


898) Sal volatile is:


899) Which of the following is responsible for depletion of the ozone layer in the upper strata of atmosphere?


900) Halogen acid used in the preparation of aqua regia is:


901) Coloured oxide is nitrogen is:


902) Bromine is liberated when an aqueous solution of KBr is treated with


903) Which of the following is not a peroxy acid?


904) Formation of ozonide is:


905) Which reagent can separate nitric oxide from nitrous oxide?


906) Which of the following is oxidised in air?


907) Which statement is not correct?


908) Which element does not form stable diatomic molecules?


909) The anhydride of pyrosulphuric acid is:


910) Ripening of fruits can be carried out in presence of


911) Ozone oxidises moist sulphur to:


912) Which is most thermodynamically stable allotropic form of phosphorus?


913) Which one is strongest oxidizing agent?


914) Dry bleaching is done by:


915) Which is not an oxo-acid of chlorine?


916) Which chemical contains chlorine?


917) A greenish-yellow coloured gas is liberated on heating a mixture of two substances which are:


918) What are the products obtained when ammonia is reacted with excess chlorine?


919) The least stable anion of oxo-acids of chlorine is


920) Non-combustible hydride is:


921) In the known interhalogen compounds the maximum number of halogen atoms is:


922) Which of the following is the life saving mixture for an asthma patient?


923) Which species is not known?


924) Which statement is wrong?


925) Oxygen reacts with each of the following elements readily, except:


926) Concentrated sulphuric acid can be reduced by


927) Which form of P shows chemiluminescence?


928) Phosgene is the name of:


929) Sulphuric acid has great affinity for water because


930) The idea which prompted Bartlett to prepare first ever compound of noble gas was:


931) Correct order of electron affinities of halogens is


932) The correct order of acidity of halogenic acids is


933) Which of the following statements regarding sulphur is incorrect?


934) Which of the following oxy-acids of phosphorus is a reducing agent and monobasic?


935) Radon is a noble gas. Its radioactivity is used in the treatment of:


936) On heating copper nitrate strongly ….. is finally obtained.


937) Pearl white is:


938) Which of the following dissolves in water but does not give any oxyacid solution?


939) The nitrate which when heated gives-off a gas or a mixture of gases which cannot relight a glowing splinter is:


940) Compounds formed when the noble gases get entrapped in the cavities of crystal lattices of certain organic and inorganic compounds are known as:


941) The mineral clevite on heating gives:


942) Bromine can be liberated from potassium bromide solution by:


943) Which element is not considered as 'chalcogens'?


944) When lead nitrate is heated it produces


945) Which is the most easily liquefiable rare gas?


946) The outermost electronic configuration of group 15 or VA elements is:


947) The noble gas used in atomic reactor, is


948) In modern process phosphorus is manufactured by:


949) Which property is most important in making fluorine the strongest oxidising halogen?


950) Which has maximum vapour pressure or most volatile or low b.p.?


951) Which of the following halogen acids has the lowest melting point?


952) Amphoteric oxide is:


953) Bone black is polymorphic form of


954) The lone pair present on N family hydrides more easily participates in bond formation in:


955) Which element reacts with chlorine to give pentachloride?


956) In which case, the order of acidic strength is not correct?


957) Which compound does not has S—S bond?


958) Compound of Sulphur used in electrical transformer is:


959) The inert gases producing maximum number of compounds are


960) The fertilizer named 'Nitrolim' is prepared by the use of:


961) Noble gases are prepared by the:


962) Sulphur trioxide can be obtained by which of the following reaction:


963) When an aqueous solution of hypochlorite is heated:


964) Xenon hexafluoride reacts with silica to form a xenon compound X. The oxidation state of xenon in X is


965) The metallic form of phosphorus is:


966) Sodium chromite is:


967) Which one of the following reaction of xenon compounds is not feasible?


968) Fixation of nitrogen means:


969) A depolarizer used in dry batteries is:


970) Liquor ammonia bottles are opened only after cooling because it has high vapour pressure and it is mild explosive.


971) In oxo-acids of halogen, X = O bond is formed as a result of:


972) Which one of the following statements regarding helium is incorrect?


973) Slow acting nitrogenous fertilizer among the following is


974) Liquor ammonia is


975) Which is the most volatile compound?


976) Fuming nitric acid is:


977) In ramsay and rayleigh's isolation of noble gases from air, the nitrogen of the air is finally converted into


978) Superphosphate of lime is used in:


979) Noble gases are:


980) Nitric acid is used in the manufacture of :


981) In halogen's group which elements has highest electron affinity?


982) Which of the following is not obtained by direct reaction of constituent elements?


983) The symbol Rn represent:


984) Which halogens oxidises water to oxygen exothermally?


985) The gas which is absorbed by ferrous sulphate solution giving blackish brown colour is:


986) Ozone is used for purifying water because


987) White phosphorus is


988) In smoke screens calcium phosphide is used, because it:


989) Nitrogen is a relatively inactive element because:


990) Cold fire is related to


991) Sides of match box have coating of


992) The non-existent species is:


993) The non-metallic element whose molecules contain maximum number of its atoms is:


994) In Kroll and ICl process of the production of titanium, the inert gas used is:


995) A positive chromyl chloride test is given by a salt containing:


996) The following species will not exhibit disproportionation reaction


997) Aqua-regia is


998) Which halogen does not show bleaching property?


999) Interhalogen compounds are more reactive than the individual halogen because:


1000) Arsine is:


1001) Which of the following isotopes is present in largest amount?


1002) Which has the highest molar heat of vaporization?


1003) Who observed helium first on the earth?


1004) Liquid ammonia is used for refrigeration because


1005) The number of different oxides of chlorine is:


1006) Boiling of dil. HCl acid does not increase its concentration beyond 20.24 per cent because hydrochloric acid:


1007) Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that:


1008) The gas which does not show oxidizing and bleaching properties is:


1009) Atomicity of phosphorus is:


1010) Ammonia is generally manufactured for fertilizers by the reaction:


1011) Each of the following is true for white and red phosphorus except that they


1012) The group 15 or VA group elements are commonly known as:


1013) The M—Cl bond energies are different in:


1014) The oxidation of thiosulphate ion by iodine gives:


1015) Which halide of nitrogen is least basic?


1016) Most acidic oxide is:


1017) King of chemicals is:


1018) Fluorine is the best oxidising agent because it has


1019) Which of the following compounds can not be stored in glass vessels?


1020) Which bond has the greatest polarity?


1021) Berthelot's salt is:


1022) The strongest oxidizing agent among the following is:


1023) Which is tribasic acid?


1024) Which chloride is explosive?


1025) All the elements of the oxygen family are:


1026) As the number of —OH groups increases in hypophosphorus acid phosphorus acid and phosphoric acid the acidic strength


1027) Nitric acid oxidizes sulphur to:


1028) Which one is correct if HCl and HF are present together in liquid state?


1029) Xenon tetrafluoride has hybridisation and structure as:


1030) Red phosphorus is chemically unreactive because:


1031) Which acid is not formed by the action of water on phosphorus pentoxide?


1032) To make nitrogen dioxide free from oxygen it is passed through U-tube:


1033) Tincture of iodine is:


1034) Sulphur does not combine with which of the following halogens to form a compound?


1035) Sulphurous anhydride is:


1036) The percentage of ozone in ozonized oxygen is about:


1037) The weakest acid among the following is:


1038) Which is planar molecule?


1039) White phosphorus may be separated from red phosphorus by:


1040) What are the products formed in the reaction of xenon hexafluoride with silicon dioxide?


1041) Mixture of sand and iodine can be separated by:


1042) Ammonia is soluble in water because it is:


1043) Sodium nitrate on heating with zinc dust and caustic soda gives:


1044) Which one is least soluble in water?


1045) Formula of iodine phosphate is:


1046) Which of the following forms vortex ring?


1047) When radioactive minerals like clevite, monazite and pitchblende are heated to 1273 k in vacuo the noble gas obtained is


1048) Which acid on keeping for long time acquires brown colour?


1049) Bacteria convert molecular nitrogen into:


1050) Nitric acid (conc.) oxidizes phosphorus to:


1051) Diamagnetic oxide of chlorine is:


1052) Which of the following is the correct order of increasing enthalpy of vaporization?


1053) The acidity of hydrides of O, S, Se, Te varies in the order


1054) Which of the following was previously known as muriatic acid?


1055) Which has the strongest bond?


1056) When molten sulphur is suddenly cooled by pouring into water, it takes the form of


1057) Which metal forms an amphoteric oxide?


1058) Which of the following is anhydride of perchloric acid?


1059) An element forms a gaseous oxide which on dissolving in water gives an acid solution. The element is:


1060) When plants and animals decay the organic nitrogen is converted into inorganic nitrogen .The inorganic nitrogen in the form of


1061) Minimum bond length will be in:


1062) A certain compound when burnt gave three oxides. The first turned lime water milky, the second turned cobalt chloride paper pink and the third formed an aqueous solution of pH 3 nearly. The elements present in the compound are:


1063) Anhydride of sulphuric acid is:


1064) Which of the following has no action with starch solution?


1065) The essential element of nitrogen fixation is:


1066) Bleaching powder is an example of:


1067) What may be expected to happen when phosphine gas is mixed with chlorine gas?


1068) Iron sulphide is heated in air to form A. an oxide of sulphur. A is dissolved in water to give an acid. The basicity of this acid is….


1069) The compound that gives chorine like smell is:


1070) When ammonia is dissolved in water:


1071) Hyponitrous acid is:


1072) Which of the following is planar?


1073) Which oxide of N is neutral?


1074) Ozone is manufactured by carrying silent electric discharge using:


1075) Which forms new compound in air?


1076) Which statement regarding He is incorrect?


1077) Reactivity of NO is due to:


1078) Which of the following statement is true?


1079) Welding of magnesium can be done in an atmosphere of:


1080) In which reaction there is no change in valency and the oxidation state?


1081) When a lead storage battery is discharged:


1082) The oxygen family is characterised by the electronic configuration:


1083) Which one of the following noble gases is used in miner's cap lamps?


1084) On heating silver nitrate strongly ……. is obtained finally:


1085) Pure phosphine is not combustible while impure phosphine is combustible, this combustibility is due to the presence of:


1086) Bleaching powder on standing forms mixture of:


1087) Which statement is not correct?


1088) Which acid can combine with its own salt again?


1089) The number of electrons in a halogen in its outermost orbit in comparison with corresponding noble gas is:


1090) Polyanion formation is maximum in


1091) The deep blue colour produced on adding excess of ammonia to copper sulphate solution is due to the presence of:


1092) The solubility of noble gases in water shows the order:


1093) Which of the following oxo-acids of chlorine is formed on shaking chlorine water with freshly precipitated yellow oxide of mercury?


1094) Which of the element listed below occurs in allotropic forms?


1095) Phosphorus is present in bones as:


1096) Noble gases are adsorbed by:


1097) Paramagnetic molecule is:


1098) Which is a poison?


1099) The element than oxidizes water to oxygen with evolution of heat is:


1100) Which of the following compounds is not an "interpseudohalogen"?


1101) Which of the following is a tribasic acid?


1102) Presence of sulphide ion cannot be confirmed by:


1103) Peroxy compound is:


1104) T-shaped interhalogen compound is


1105) Nitre cake is:


1106) Helium is used in balloons in place of hydrogen because it is


1107) The O—O bond length in ozone is:


1108) The lightest, non-inflammable gas is:


1109) The reaction in the Kipp's apparatus stops on closing the outlet, because:


1110) Which of the following chloride is water insoluble?


1111) Which radical can bring about the highest oxidation state of a transition metal?


1112) Which of the following halogens can replace others form their salt solutions?


1113) Metal reacts with Sulphur to give:


1114) The non-metal other than graphite having metallic lustre is:


1115) Ozone turns benzidine paper:


1116) Which statement is incorrect?


1117) The bond Br—Cl is:


1118) Which element is extracted commercially by the electrolysis of an aqueous solutions of one of its compounds?


1119) Which of the following gases exists more abundantly in nature than the others?


1120) Which inert gas has the highest boiling point?


1121) Ammonium dichromate is used in some fireworks. The green coloured powder blown is:


1122) A gas, that relights glowing splinter, is


1123) The acid which forms two series of salts:


1124) Which among the following factors is the most important in making fluorine the strongest oxidizing agent?


1125) The structure of white phosphorus is:


1126) Halogens are:


1127) Radon was discovered by:


1128) The general formula of hypophosphorous acid is:


1129) Ammonia on catalytic oxidation gives an oxide from which nitric acid is obtained. The oxide is:


1130) Ammonia is dried over


1131) The structural formula of hypophosphorus acid is


1132) Which one of the following oxides of nitrogen dimerises into a colourless solid /liquid on cooling?


1133) Which ion cannot be precipitated from water?


1134) Ozone acts as:


1135) Correct order of reactivity


1136) When bleaching powder is treated with carbon dioxide:


1137) Red P can be obtained by white P by


1138) A solution of chlorine in water contains:


1139) Helium gives a characteristic spectrum with:


1140) Molecules of a noble gas do not posses virbrational energy because a noble gas


1141) Atomicity of sulphur in rhombic sulphur is


1142) When chlorine is passed through concentrated solution of KOH, the compound formed is


1143) Which of the following oxides of nitrogen is the anhydride of nitrous acid?


1144) Halogen molecules are:


1145) Least stable oxide of chlorine is


1146) Bromine water is decolourised by:


1147) Fluorine reacts with water to give


1148) The electronic configurations of four elements are given below. Which element does not belong to the same family as others?


1149) Among the noble gases, xenon reacts with fluorine to give stable xenon fluorides because


1150) Which of the following is most volatile?


1151) Which phosphorus reacts with KOH solution to produce phosphine gas?


1152) In solid state of noble gases, the atoms are held together by:


1153) In the treatment of leukaemia……… is used.


1154) Among K, Ca, Fe and Zn , the element which can form more than one binary compound with chlorine is


1155) Red P is used in making:


1156) Phosphorus pentoxide is widely used as


1157) Ozone with KI solution produces


1158) Which are hydrolysed by water?


1159) In order to prevent the hot metal filament from getting burnt, when the electric current is switched on, the bulb is filled with:


1160) Weldon mud is:


1161) Which of the following is incorrect?


1162) Which of the following has—O—O—linkage?


1163) Which is correct statement?


1164) If two litre of air is passed repeatedly over heated copper and heated Mg till no further reduction in volume takes place, the volume finally obtained will be approximately:


1165) The chemical used for cooling in refrigeration or in manufacture of ice is:


1166) What products are expected from the disproportionation reaction of hypochlorous acid?


1167) If an allotropic form changes slowly to a stable form. It is called


1168) The noble gas which behaves abnormally in liquid state is


1169) Smelling salt is:


1170) Xenon best reacts with:


1171) Sulphate ion has …… geometry.


1172) Sulphur in + 3 oxidation state is present in


1173) Oleum is


1174) Which of the following is correct with reference to protonic acids?


1175) A helium atom on losing an electron becomes


1176) Concentrated nitric acid on heating decomposes to give:


1177) Bromine is obtained on a commercial scale from:


1178) Among the following, the basic oxide is


1179) The blue coloured gas is:


1180) The gas used in the manufacture of ice-cream is:


1181) A white precipitate is obtained on hydrolysis of:


1182) one gas bleaches the color of the flower by reduction while the other by oxidation.The gases are:


1183) In a given sample of bleaching powder the percentage of available chlorine is 49. The volume of chlorine obtained if 10 g of the sample is treated with HCl at NTP is:


1184) Which one has the highest percentage of nitrogen?


1185) Which has maximum pH in aqueous solution?


1186) Which of the following is not a drying and dehydrating agent?


1187) Large deposits of sulphur in nature are found in the form of:


1188) Which of the following does not exist?


1189) In the upper layer of the atmosphere ozone is formed by the


1190) The compound that attacks pyrex glass is:


1191) Calcium phosphide is used in smoke screens because it


1192) Gaseous HCl is a poor conductor of electricity, while its aqueous solution is a good conductor. This is because:


1193) The inert gas obtain from the monozite sand is


1194) Which of the following occurs in free state?


1195) Oxygen exhibits positive oxidation state in


1196) Which one is not an acid salt?


1197) The poisson's ratio for inert gases is:


1198) Oxygen is gas but sulphur is solid because:


1199) The noble gas which is not found in atmosphere?


1200) In contact process impurities of arsenic are removed by:


1201) Concentrated sulphuric acid does not act as:


1202) Which halogen does not react with water?


1203) Which hydride is most acidic?


1204) Which of the following cannot be formed?


1205) The discovery of isotopes began with the experiments with:


1206) In the oxo-acids of chlorine Cl—O bond contains:


1207) Make the element which displaces three halogens from their compounds


1208) Which of the following phosphorus is most stable?


1209) Arsenic acid is:


1210) The halogen that is most readily reduced is:


1211) Ozone reacts with dry iodine to give:


1212) Fluorine absorbs ….. portion of light and appears yellow.


1213) Which of the element of nitrogen family produce maximum number of oxy-acids?


1214) Halogens are placed in the VIIA group or gp. 17 of the periodic table, because:


1215) Nitrosyl chloride is:


1216) The substance used in smoke screen is


1217) Which is cyclic phosphate?


1218) Which possesses highest percentage of ionic character?


1219) Elements O, S, Se and Te are usually known as:


1220) Bleaching powder slowly loses its activity when it stands in air. This is due to:


1221) Phosphine is produced by adding water to


1222) Which statement is false?


1223) Which of the following is more soluble in water?


1224) The number of hydrogen atom (s) attached to phosphorus atom in hypophorus acid is?


1225) Which of the following compound is tribasic acid?


1226) Which one of the following cations does not form a complex with ammonia?


1227) Nuclear fusion produces


1228) Which of the following oxide does not form acidic aqueous solution?


1229) Which possesses least stable covalent P—H bond?


1230) Which one below is a pseudohalide?


1231) The Nessler's reagent contains:


1232)
Interhalogen compounds are:


1233) Fluorine does not show positive oxidation states because:


1234) The correct order of the thermal stability of hydrogen halides (H-X) is


1235) Noble gases can be separated by:


1236) The solubility of iodine in water is greatly increased by:


1237) The catalyst used in the preparation of red P from yellow P is:


1238) Which of the following statements is not valid for oxoacids of phosphorus?


1239) Which statement is not true for astatine?


1240) The only element in VIA group or group 16 elements, which is definitely a metal, is:


1241) Nitrogen dioxide


1242) The gas used in gas thermometer is:


1243) Which of the following acids does not attack Cu and Ag?


1244) Number of isotopes of oxygen is:


1245) Bromine vapour turns moist starch-iodide paper:


1246) The brown yellow colour often shown by nitric acid can be removed by:


1247) There is an ozone layer at a height of about 29 kilometres above the surface of the earth. Which of the following statements is true?


1248) Deep sea divers used to respirate is a mixture of


1249) Density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen because aerial nitrogen contains:


1250) Antichlor is a compound:


1251) Oleum is


1252) Which reacts rapidly with oxygen in the air at ordinary temperature?


1253) The chief source of iodine in which it is present as sodium iodate is


1254) As the atomic number of the halogens increases, the halogens:


1255) An interhalogen compound is:


1256) Phosphine is not collected in air because:


1257) Bones glow in the dark, because:


1258) Oxygen exhibits positive oxidation state with:


1259) The atom larger in size as compared to oxygen is:


1260) What is the oxidising agent chlorine water?


1261) Which of the following halogens is solid at room temperature?


1262) The anhydride of nitrous acid is:


1263) Which of the following is strongest oxidizing agent?


1264) Which sulphide is insoluble in yellow ammonium sulphide?


1265) Which one is most basic in character?


1266) Which oxide is alkaline?


1267) Oleum is chemically


1268) Among halogens maximum oxides are formed by:


1269) Which statement is false?


1270) Freons are used as:


1271) Sulphur molecule exists as:


1272) Noble gases are adsorbed by


1273) Phosphorus when exposed to air burns spontaneously because:


1274) Freons are:


1275) Normality of pure sulphuric acid is:


1276) A hydride of nitrogen which is acidic is


1277) The highest ionization potential in a period is shown by:


1278) The percentage of nitrogen in urea is about:


1279) Phosphate mineral of phosphorus is:


1280) Dithionic acid has the formula:


1281) Among the following nitrates, lead nitrate, silver nitrate, sodium nitrate and ammonium nitrate; the one that decomposes without leaving any solid residue is


1282) Ammonia and phosphine resemble each other in:


1283) Tear gas is:


1284) When ammonium chloride is heated with NaOH, a gas is evolved, which has


1285) When phosphine is bubbled through solution of silver nitrate…..is precipitated.


1286) Hydrolysis of one mole of peroxodisulphuric acid produces:


1287) Which has the same electronic configuration as of inert gas?


1288) Glacial phosphoric acid is:


1289) Which of the following pairs is not correctly matched?


1290) The number of hydrogen atom (s) attached to phosphorus atom in pyrophosphorus acid is


1291) Which of the following is not correct?


1292) Which halide does not hydrolyse?


1293) Caliche is:


1294) The number of paired electron in oxygen molecule are


1295) The structural formula of hypophosphorous acid is


1296) The hydride of group 16 elements showing maximum tendency for complex formation is


1297) The noble gas which forms interstitial compounds is


1298) Iodine may be liberated from sodium iodate by:


1299) Which oxide is of different type than others?


1300) Oxide of nitrogen used as a catalyst in the lead chamber process for the manufacture of Sulphuric acid is:


1301) The spectrum of helium is similar to:


1302) The compound used as refrigerant is:


1303) Which would quickly absorb oxygen?


1304) Phosphine is not obtained by the reaction when:


1305) Nitrogen forms …. Oxides.


1306) The compound of Sulphur that can be used as refrigerant is:


1307) Oxygen can be obtained from bleaching powder by:


1308) The catalyst used in the manufacture of ammonia is


1309) Substance used in Holme's signal is:


1310) Which one of the following combines with Fe (II) ions to form a brown complex?


1311) All the three atoms of ozone are used up when it reacts with:


1312) Which can act as an acid in sulphuric acid?


1313) Which is used in vulcanisation of rubber?


1314) Superphosphate of lime is obtained from the reaction of:


1315) The anhydride of orthophosphoric acid is:


1316) Which is bad conductor of electricity?


1317) Which compound has an incorrect formula?


1318) The chloric acid and chlorates are:


1319) Which of the following is known as Berthelot's salt?