Practice Test


1) Which of the following statement is not true both for B and Al?


2) In which of the following elements + 1 oxidation state is more stable than +3 ?


3) Which of the following is used in high temperature thermometry?


4) Which of the following element is present most abundant in the earth's crust?


5) Which of the following is a Lewis acid?


6) Boron compound behave as Lewis acid because of their


7) The purification method of bauxite containing iron oxide as impurity is known as


8) Which of the following imparts green color to the burner flame ?


9) What is molecular formula of Borazole ?


10) Thermite is a mixture of iron oxide and


11) Which of the following is not a protonic acid ?


12) The pair of amphoteric hydroxide is


13) Which of the following is not correct with regard to the structure of diborane ?


14) Which of the following mineral does not contain Al ?


15) Which is true for an element R present in group 13 of the period table ?


16) Which is the most amphoteric ?


17) Which of the following statement is not true about potash alum?


18) Aluminium is most abundant in earth's crust, yet it is obtained from bauxite because


19) Corundum is


20) Purification of aluminium by electroytic refining is known as


21) Which one of the following is used to remove silicon dioxide in the Serpeck's process of purification of bauxite ?


22) Corundum is an ore of


23) In Hall's process, the main reagent is mixed with


24) When bauxite powder is mixed with coke and reacted with nitrogen at 2075 k, carbon monooxide and X are formed. What is the gas formed. What is the gas formed when X is reacted with water?


25) The chief ore of Al is


26) Which one of the following has the lowest m.pt.?


27) Alum is not used


28) Which of the following statement is incorrect ?


29) Aluminium(III) chloride forms a dimer because


30) Which out of the following is potash alum?


31) Which of the following is not a Lewis acid ?


32) The aqueous solution of potash alum is


33) Aluminium reacts with concentrated HCl and Concentrated NaOH to liberated the gases...................respectively


34) A layer of coke is spread over bauxite during extraction of aluminium. This acts as a/an


35) Which one of the following element is non-metal?


36) In diborane the two H-B-H angles are nearly


37) Which metal is protected by a layer of its own oxide?


38) Aluminium becomes passive in


39) Action of caustic soda with soda on aluminium hydroxide gives a compound having formula


40) Aluminium reacts with caustic soda to form


41) 'Thermite ' is a mixture of X parts of ferric oxide and Y parts of aluminium powder. X and Y respectively are


42) Which of the following is the electron deficient molecule ?


43) Which one is metaboric acid ?


44) Which of the following does not give a borax bead test?


45) In a molecule of diborane


46) Which of the following ions does not exist in an aqueous solution?


47) Among the following, which show the correct order of magnitude of inert-pair effect ?


48) Orthoboric acid contains


49) Which of the following statement is incorrect?


50) on hydrolysis, diborane produce


51) By which of the given reaction boeazine prepared?


52) Which of the following statement is incorrect ?


53) Which of the following statement is incorrect


54) The reducing power of Al, Ga, In and Tl are in the same order


55) Aluminium chloride ionizes in an aqueous solution because


56) Which of the following metal does not show an inert - pair effect?


57) Molecular weight of anhydrous aluminium chloride is


58) Borax on heating with cobalt oxide forms a blue bead of


59) All alum contains


60) Which of the following structure correctly represents the boron trifluoride molecule ?


61) The borax bead is chemically


62) By which of the following reaction is borazine prepared ?


63) Chemically borax is


64) Which of the following structure does not represent the compound given in parenthese ?


65) Aluminium deposition as vapour on glass form a good mirror, essentially because


66) When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain


67) Boric acid is prepared from borax by the action of


68) Anodised aluminium is


69) Boric acid is not used as


70) Alane is chemically


71) Reactivity of borazole is greater than that of benzene because


72) Mineral of aluminium that does not contain oxygen is


73) Which one of following elements has the highest melting point ?


74) The element which show least metallic character is


75) Which member of group 13 does not exhibit the group valency in its compounds ?


76) Group 13 element shows


77) Which of the following statement is incorrect ?


78) The melting point of group 13 follows the order


79) Which of the metal chlorides has maximum covalent character ?


80) Among the halides of the element of group 13 the one which is most acidic is


81) Which one of the following oxides is strongly basic ?


82) The amphoteric oxide from among the following is


83) The power of halides of boron to act as Lewis acids decrease in the order


84) Pick up the wrong statement


85) Which of the following hydroxide is acidic ?


86) In borax bead test the coloured ions give characteristic colored beads due to formation of


87) Which of the following is not isomorphous with true alum and is called pseudoalum ?


88) Which of the following property does not support anomalous behaviour of boron?


89) Two elements X and Y react separately with highly electropositive metal to form binary compounds, which upon hydrolysis yield mixture of boranes and silanes X and Y separately are


90) Boric acid is polymeric due to


91) Which of the following s not Lewis acid ?


92) Which of the following statement is correct ?


93) The type of hydridization of boron in diborane is


94) The type of hydridization of boron in diborane is


95) The hardest compound of boron is


96) Which of the following is a gas ?


97) Inorganic benzene is


98) Which is used as disinfectant?


99) Which of the following does not have a tetrahedral structure ?


100) Which of the following statement is false ?


101) Borax is not used


102) Aluminothermy used for on the spot welding of large iron structure is based upon the fact that


103) The chemical formula of bauxite is


104) Inert pair effect plays an important role in case of


105) Which of the following is correct statement?


106) A particular element belong to group 13 and second period of the periodic table, it is


107) In the Hoope's process for refining of Al the fused materials form three different layers and they remain separated during electrolysis also. This is because


108) In the electrolytic extraction of aluminium fused cryolite is added


109) The chemical composition of cryolite mineral


110) Which of the following process does not involve a catalyst ?


111) Aluminium vessels should not be washed with materials containing washing soda since


112) Aluminium is more reactive than iron but aluminium is less easily corroded than iron because


113) Which is not a mineral of aluminium ?


114) Aluminum chloride is a / an


115) Aluminium oxide is not reduced by chemical reactions since


116) Alum is a water purifier because it


117) An example of alum is


118) Aluminium helps in purifying water by


119) Aluminium is extracted by the electrolysis of


120) Heating an aqueous solution of aluminium chloride to dryness will give


121) ON the addition of mineral acid to an aqueous solution of borax, the following compound is formed


122) Alum is used by dyers of clothes


123) In the aluminothermite process, Al acts as a/an


124) Hydrogen will not reduce


125) In the electrolysis of aluminium, cryolite is added to


126) Alumina is


127) Which is electrophile ?


128) Moissan Boron is


129) Aluminium reacts with caustic soda to form


130) The chief impurity present in red bauxite is


131) Which is strong Lewis acid ?


132) Borax is prepared by treating colemanite with


133) Heating an aqueous solution of aluminium chloride to dryness will give


134) Galena is an ore of


135) The halide which is not hydrolysed is


136) Which of the following statements is correct with respect to the property of element with increase in atomic number in the carbon family (group 14)?


137) Which of the following bonds has the most polar character ?


138) Which of the following is most dense ?


139) The oxide which cannot act as reducing agent is


140) A pseudo solid is


141) Silicon is an important constituent of


142) Cassiterite is an ore of


143) Quartz is crystalline variety of


144) Mark the oxide which is amphoteric in character


145) Which one of the following allotropic forms of carbon is isomorphous with crystalline silicon


146) The element that does not form a monoxide is


147) Butter of tin is


148) Which of the following is most stable ?


149) Thomas slag is


150) Which of the following has no tin in its composition ?


151) Which of the following halides is the most stable ?


152) C and Si have


153) Silica is soluble in


154) Carborundum is


155) The percentage of lead in lead pencil is


156) Which of the following sulphate is insoluble in water


157) The metal used for making radiation shield is


158) The substance used as a smoke screen in warfare is


159) The sequence of acidic character is


160) Composition of glass is


161) Which of the following show bonds in silicones ?


162) Red lead is


163) In the manufacture of cement which of the following is used ?


164) Glass reacts with HF to produce


165) In laboratory, silicon can be prepared by the reaction of


166) Which does not exist ?


167) Which of the following is most electronegative ?


168) Important ore of lead is


169) The most stable +2 oxidation state is exhibited by


170) Water is an important fuel. It is a mixture of


171) When a mixture of air and steam is passed over red hot coke, the out going gas is


172) Carbon atoms in diamond are bonded with each other in configuration


173) Which one of the following characteristic property of carbon ?


174) Diamond is an example of


175) Water gas is produced by


176) Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of


177) Which of the following has the highest calorific value ?


178) Which of the following types of forces bind together the carbon atoms in diamond ?


179) Carbogen is


180) In graphite, electrons are


181) Higher percentage of carbon is found in


182) Diamond and Emerald are formed of


183) The green house effect is caused by


184) Which one of the following allotropic forms of carbon isomorphous with crystalline silicon ?


185) In graphite, the sheets are held by


186) Graphite is


187) Pyrosilicate ion is


188) The variety of glass used in making lenses and prisms is


189) An alloy of Pb and Sn in equal proportion is called


190) Graphite is similar to


191) A fibrous mineral which can withstand red hot flames without any damage is


192) The stability of the tetrahalides of carbon decrease in the order


193) Which of the following is most ionic ?


194) Which of the following metal carbides may be called a methanide?


195) Carbon -60 contains


196) Which of the following statement is correct ?


197) In carbon monoxide molecule, carbon and oxygen are linked by


198) Which of the following statement is incorrect ?


199) In carbon -60 all carbon atoms are


200) Which of the following compounds is used as an abrasive ?


201) Which of the following is industrial fuel ?


202) Which of the following oxides of carbon is unstable ?


203) Chemically zeolites are


204) lead sugar is


205) Carbon dioxide is gas but silica is a solid because


206) Which of the following show bond in silicone


207) Which element does not exhibit allotropy ?


208) Semi water gas is a mixture of


209) Wood charcoal is used in gas masks because it


210) Aqueous solution of sodium silicate is


211) Which gas is essential constituent of almost all fuel gases ?


212) Which gas present in atmosphere darkens the surface painted by white lead ?


213) Bell metal is an alloy of


214) Tin plague is the


215) Which is the least pure form of carbon ?


216) The component present in greater proportion in water gas is


217) tin cry refers to


218) Plumbo-solvency means dissolution of lead in


219) A reducing agent is


220) Which oxide has three dimensional structure


221) Purest form of silica is


222) Which gas has more percentage in coal gas?


223) Least stable hydride is


224) Which is not a allotrope of carbon ?


225) Which has peroxide linkage ?


226) Which is not the property of diamond ?


227) Minium is


228) Which is not correct?


229) Litharage is not commonly


230) Which one of these is acidic ?


231) Carbon forms a large no. of compound because it has


232) Ge(II) compounds are powerful reducing agent whereas Pb(IV) compounds are strong oxidants .This can be due to


233) The composition of the common glass is


234) The shape of carbon dioxide molecule is


235) Which of the following combines with haemoglobin of the blood to form caboxyhaemoglobin?


236) Which of the following is amphoteric ?


237) Which of the following has maximum bond dissociation energy ?


238) A gas which burns with blue flame is


239) Which of the following gases causes pollution when present in the exhaust fumes of vehicles ?


240) Natural gas is


241) Lead sulphate is soluble in


242) Which of the following lead oxides is 'Sindhur'?


243) Atomic orbitals of carbon involved in diamond structure are


244) Wood charcoal is used to decolourise sugar because it


245) In graphite, C atom is in ..................state


246) An oxide of lead which is used in lead storage batteries , in safety matches and is powerful oxidizing agent is


247) Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite


248) Glass is a


249) The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards of the tin buttons of their uniforms. White metallic tin button got converted to grey powder. This transformation is related to


250) In silicon dioxide


251) The stability of dihalides of Si, Ge, Sn and Pb increase steadily in the sequence


252) Carborundum is obtained when silica is heated at high temperature with


253) Moderate electrical conductivity is shown by


254) The electronegativity of the following elements increase in the order


255) The species that does not contain peroxide ions is


256) Material used in solar cell contain


257) Which of the following halides is least stable and has double existence ?


258) Which of the following oxides is neutral ?


259) White lead is


260) The composition of the common glass is


261) In laboratory burners, we use


262) Which of the following oxide is amphoteric in character ?


263) In silicon dioxide


264) A metal M forms chlorides in +2 and +4 oxidation states Which of the following about these chlorides is correct ?


265) Statement 1 : White phosphorus is stored under water.
Statement 2 : White phosphorus is highly reactive and catches fire spontaneously in air.


266) Statement 1 : Boranes are volatile and decompose to boron, and hydrogen at red heat.
Statement 2 : All the boranes react with ammonia depending on the conditions.


267) Statement 1 : Among chalcogens, tendency of catenation is maximum for sulphur.
Statement 2 : S-S bond dissociation energy is higher then O-O bond dissociation energy.


268) Statement 1 : Si-Si bonds are weaker than Si-O bonds.
Statement 2 : Silicon forms double bonds with itself.


269) 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.


270) Boron nitride on reacting with caustic alkali gives:


271) The different layers in graphite are held together by


272) Colemanite is a mineral of:


273) Which of the following is a mixed oxide?


274) In the sale of diamonds the unit of weight is carat. One carat is equal to:


275) Which gas present in atmosphere darkens the surface painted by white lead?


276) Which of the following is most abundant in the earth crust?


277) Which form of carbon has a two-dimensional sheet-like structure?


278) Extraction of metal from the ore cassiterite involves


279) An alumina-silica clay, called bentonite is dropped from aeroplanes in the slurry form for:


280) Gun shots are made of lead with a little arsenic. The function of As is to increase:


281) The glass having smallest coefficient of thermal expansion is :


282) Carborundum is obtained when silica is heated at high temperature with


283) Tin plague is the:


284) Water glass is:


285) If a person is injured by the shot of a gun and all the pellets could not be removed, it may cause poisoning by:


286) Which property is common in diamond and graphite?


287) In which of the following the inert pair effect is most prominent?


288) Which oxide has three dimensional structure?


289) Diamond and graphite are:


290) Minium is:


291) Which of the following is called alum?


292) The carbon of microphones used in public address systems is :


293) Aluminium is extracted by the electrolysis of


294) In Gold Schmidt reaction, certain metallic oxides are reduced to the metallic state by-heating with:


295) Formula for agate is


296) Pure CO can be obtained from:


297) Which is used for the manufacture of optical instruments?


298) Which element has a limited coordination number of four?


299) In Goldschmidt aluminothermic process, thermite contains


300) During the electrolysis of cryolite, aluminium and fluorine are formed in molar ratio


301) Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which is the best absorbing material for the carbon dioxide?


302) Which gas is used in airated water?


303) Which is not an ore of lead?


304) Borax on heating with cobalt oxide forms a blue bead of:


305) Inorganic benzene is:


306) The correct formula of borax is:


307) The formula of mineral borax is


308) The hardest compound of boron is:


309) For purification of alumina, the modern processes most useful when (i) the impurity present is a lot iron oxides and (ii) the impurity present is a lot of silica, are


310) Tin, a silvery white metal exists in:


311) Which of the following oxide is amphoteric?


312) Which of the following does not have a tetrahedral structure?


313) Which of the following oxides is strongly basic?


314) Aluminium metal is corroded in coastal places near to the sea, because protective oxide film:


315) The most abundant metal in the earth crust


316) Which mixed sulphate is not an alum?


317) In the aluminothermic process, Al acts as a/an


318) Which is used as control rods in nuclear reactors?


319) Potash alum is water soluble and ionises in aqueous solution to give:


320) Lead sugar is:


321) Which does not exist?


322) Which form of carbon is used in making boot polish, printing ink, paint and black varnish?


323) Which of the following shows bond in silicone?


324) Which of the following organo-silicon compound on hydrolysis will give a three dimensional silicone?


325) Tin sulphide is:


326) Lead pipes are not suitable for drinking water because


327) Aluminium forms:


328) Which oxidation states are the most characteristics of lead and tin respectively?


329) The alloy used in preparation of balance beam:


330) The substance used to impart green colour to glass is:


331) Which metal powder if spread in air, becomes hazardous?


332) Crystalline silicon was obtained by:


333) Aluminium is more reactive than iron but aluminium is less easily corroded than iron because:


334) Silicon hydrides are named as:


335) Which compound can make fire proof clothes?


336) A kettle which becomes furred-up in use has inside it a deposit composed mainly of:


337) Aluminium is obtained by


338) Which of the following is not correct in case of boron nitride?


339) Zn on heating with barium carbonate gives :


340) Hybridisation of boron in diborane is:


341) When tin is treated with concentrated nitric acid


342) The ability of a substance to assume two or more crystalline structures is called:


343) Glass is soluble in:


344) Duralumin is an alloy of:


345) Among the following the purest form of carbon is :


346) Which of the following anion is present in chain structure of silicate?


347) Tin reacts with:


348) Which gas is responsible for green house effect?


349) Al and Ga have the same covalent radii because of:


350) Magnalium contains


351) Crystalline form of silica is called


352) Borax is prepared by treating colemanite with:


353) Which is not the property of diamond?


354) What happens when steam is passed over red hot carbon?


355) In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to


356) Purest form of silica is :


357) Alzeimer's disease is caused due to Al interaction with internal organs of the body if food is contaminated with Al. This disease


358) Metalloid among the following is:


359) Alumina may be converted into anhydrous aluminium chloride by:


360) The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence


361) PbO is


362) Among the following the maximum covalent character is shown by the compound:


363) Asbestos is chemically:


364) The structure of diborane contains:


365) Borax is:


366) Heating an aqueous solution of aluminium chloride to dryness will give


367) Hoope's process is used for the purification of the metal


368) Which of the following is the electron deficient molecule?


369) A gas does not turn lime water milky, supports the combustion of burning magnesium. It has no smell and is colourless. It extinguishes a glowing splint but under some circumstances reacts with oxygen and hydrogen. It is not poisonous. The gas is likely to be :


370) Which compound is solid?


371) The first I.P. of Al is smaller than that of Mg because:


372) Which type of forces bind together the carbon atoms in diamond?


373) Ordinary glass is:


374) The common semiconductor is:


375) Alumina is


376) Plumbo-solvency means dissolution of lead in:


377) Which of the following does not exist in free form?


378) On doping Ge metal with a little of ln, one gets:


379) Vapour density of which gas is near to air?


380) Muddy water can be purified through coagulation by using


381) Carbon monoxide on heating with sulphur gives:


382) In electrolysis of aluminium oxide which of the following is added to accelerate the process


383) The most abundant gas in ordinary air among the following is:


384) Silicon is usually found in:


385) Corundum is:


386) Synthetic gas is a mixture of:


387) Lead pipes can be used for:


388) The core of a non-luminous Bunsen burner flame is observed to be yellow in colour. This is because of:


389) Aluminium is not present in which of the following mineral?


390) The correct order of decreasing ionic nature of lead dihalides is :


391) Diborane does not undergo cleavage reaction with:


392) The correct Lewis acid order for boron halides is:


393) Formula of felspar is


394) Stannous oxide can be obtained by:


395) Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of :


396) The fraction by volume of carbon monoxide in producer gas is about:


397) Alum is not used:


398) The mass of carbon anode consumed (giving only carbon dioxide) in production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass of Al = 27)


399) Carbon dioxide dissolves under pressure in water to give:


400) Which fuel has the highest calorific value?


401) Which of the following is not correct?


402) The chemical formula of sindhur is


403) Aluminium oxide is not reduced by chemical reactions since


404) When sand is heated with hydrofluoric acid and a wet rod is brought in contact with vapours evolving a white deposit is due to


405) Aluminium reacts with caustic soda to form


406) Which is not a characteristic property of carbon?


407) Which of the following is more stable?


408) The relative Lewis acid character of boron trihalides is in the order


409) In diborane the two H-B-H angles are nearly


410) Thermite is a mixture of


411) Alum is added to muddy water because


412) White lead or basic lead carbonate is:


413) Among the various allotropes of carbon :


414) Oxides of silicon are:


415) The reducing agent in thermite process is


416) Man dies in an atmosphere of carbon monoxide, because it:


417) Which metal is protected by a layer of its own oxide?


418) Which has highest b.p.?


419) There are two H-bridge bonds in diborane molecule because there are:


420) Which of the following oxides is amphoteric in character?


421) Water gas is produced by:


422) CO forms a volatile compound with:


423) Red lead is


424) Which one of the following statements about the zeolite is false?


425) The order of acidic strength of boron trihalides


426) Alane is chemically:


427) Heating an aqueous solution of aluminium chloride to dryness will give:


428) Buckminster fullerene is


429) Lead (IV) oxide is obtained by :


430) Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that, graphite


431) The composition of the common glass is


432) Aluminium becomes passive in nitric acid because it:


433) Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is


434) An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to


435) Which of the following form dimeric halides?


436) Aluminium appears like gold when it is mixed with:


437) The C—X bond energy order for carbon tetra halides is:


438) An example of a major air pollutant is:


439) Which of the following is used in making printer's ink, shoe polish, black varnish and paint?


440) Pewter is an alloy of :


441) Nickeloy is an alloy containing:


442) Rose metal is an alloy of:


443) The hottest part of the Bunsen burner flame is:


444) An insulator is:


445) By chlorinating carbon disulphide with chlorine in presence of aluminium chloride, we get:


446) The element which forms neutral as well as acidic oxides is:


447) In the alumino-thermic process, aluminium acts as:


448) Carborundum is the commercial name of :


449) Which is amphoteric compound?


450) Diborane reacts with water to form:


451) Pyrex glass is a mixture of :


452) The chief impurity present in red bauxite is


453) Amorphous boron on burning in air forms:


454) Be and Al exhibits many properties which are similar but the two elements differ is:


455) What is the state of hybridization of carbon in fullerene?


456) Boron was isolated by:


457) Borax bead test is responded by:


458) Which of the following gives propyne on hydrolysis?


459) A fibrous mineral which can withstand red hot flames without any damage is


460) Which has highest bond energy?


461) Lead may be replaced from its salt solution by:


462) Which is not correct?


463) On the addition of mineral acid to an aqueous solution of borax, the compound formed is:


464) An aqueous solution of potash alum gives


465) Unstable lead compounds are


466) Which is neutral to litmus?


467) Bell metal is an alloy of :


468) Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:


469) Coke is obtained from coal by:


470) The liquid field metal expanding on solidification is


471) Graphite is used in nuclear reactors:


472) Carbon tetrachloride has zero dipole moment because of:


473) Massicot is prepared by:


474) Animal charcoal is used for decolourisation of sugar because:


475) Pyrosilicate ion is:


476) Which is used as disinfectant?


477) What is the number of free electrons present on each carbon atom in graphite?


478) Diaspora is:


479) Which of the following reactions occurs at the cathode during the charging of lead accumulator?


480) The coal form containing maximum percentage of carbon is:


481) Water softner is


482) The main constituents of coal gas are:


483) Carbon dioxide is a gas but silica is a solid because :


484) Alums are used for


485) Lead pipes are corroded quickly by


486) Melting point is highest for:


487) Purification of alumina is essential because:


488) Which one shows most pronounced inert pair effect?


489) Producer gas, a fuel and also a source of nitrogen is obtained by:


490) Which of the following is an ore of lead?


491) White lead is


492) Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. While metallic tin buttons got converted to grey powder. This transformation is related to


493) Anodised aluminium is:


494) The variety of glass, used for the preservation of eggs is:


495) Solder is an alloy of lead with


496) Which of the following is used for making optical instruments?


497) Tincal is


498) Tin (II) fluoride (anhydrous) can be obtained by :


499) Producer gas is a mixture of:


500) Which statement is false?


501) Which of the following is the correct statement for red lead?


502) The formula of potash alum is


503) In diborane the two H-B-H angles are nearly


504) Potash alum dissolves in water to give a/an


505) Which is the least pure form of carbon?


506) The calorific value of carbon is about ……. kcal.


507) Aluminium metal is refined by


508) Which one of the following metals work as a reduction in smelting process?


509) Which of the following has structure similar to graphite?


510) Tin (II) chloride (anhydrous) can be obtained:


511) An element A dissolves both in acid and alkali. It is an example of


512) Which statement is not true about potash alum?


513) Which melts in boiling water?


514) Solder is an alloy of :


515) Hardest element of III A group of gp.13 is:


516) Tin cry refers to:


517) The composition of the common glass is


518) The method of zone refining of metals is based on the principle of


519) Feldspar is:


520) The thermal stability order for group 14 halides is:


521) Tungsten carbides is an example of:


522) The hybridization of boron atom in orthoboric acid is:


523) Which of the following is known as inorganic benzene?


524) Which is not an allotrope of carbon?


525) Carbogen is:


526) Mica is chemically:


527) The compound used in lead accumulators is:


528) When tin is treated with concentrated nitric acid


529) Which of the following is pseudoalum?


530) Which element does not exhibit allotropy?


531) One that marks the paper like lead is:


532) Carbon monoxide will not reduce:


533) Graphite is made by heating coke with silica for many hours in a :


534) Which of the following undergoes sublimation?


535) Which is used as mordant?


536) Molecular weight of anhydrous aluminium chloride is:


537) The elements of IV A group or group 14 have 4 electrons in their outermost orbit. They:


538) In purification of bauxite by hall's process


539) Newton's alloy contains :


540) Boron readily dissolves in:


541) Which of the following is not a Lewis acid?


542) The protective film of oxide on the surface of Al metal may be strengthened by:


543) Sapphire is a mineral of:


544) Which is/are fire extinguishers?


545) The borax bead is chemically:


546) Which of the following is only acidic in nature?


547) Which poisonous gas is present in the exhaust of car?


548) A metallic oxide which imparts purple colour to pottery is:


549) Inorganic benzene is


550) The cryolite is:


551) Quartz is made of silicon and oxygen joined in a network arrangement that is similar to :


552) Eka aluminium is:


553) Boric acid is prepared from borax by the action of:


554) The acid used for etching the glass is:


555) The greatest percentage of CO is in:


556) The process used for purification of bauxite are containing iron oxide impurity is known as:


557) Which of the following does not contain silicon?


558) Which statement is correct?


559) Which one of the following statements about the zeolites is false?


560) Least stable hydride is :


561) Which is true for an element R present in III group of the periodic table?


562) Which is correct oxidation state of lead?


563) In III A group, Tl (thalium,) shows +1 oxidation state while other members show +3 oxidation state, why?


564) Which of the following is a three dimensional silicate?


565) Hydrogen forms a bridge in the chemical structure of:


566) Boron differs from the other members of group 13 because it:


567) Which of the following is a use of alum?


568) Which fuel has the highest calorific value (kJ/kg)?


569) Which of the following is a gas?


570) Lead sulphate is soluble in :


571) Colour is imparted to glass by mixing:


572) Dry ice is


573) Mineral of aluminium that does not contain oxygen is:


574) Which one of the following ores is best concentrated by froth-floatation method?


575) Which metal is powdered, suspended in oil and used as paint?


576) Aqueous solution of potash alum is:


577) In alumino thermic process, Al is used as


578) The composition of mica is:


579) Coal gas:


580) Lead chromate is……..in colour.


581) Which halide is least stable and has doubtful existence?


582) Litharge is not commonly used in :


583) The precious Ruby stone is:


584) Wood charcoal is used in gas masks because it:


585) On strong heating lead nitrate gives:


586) Which is not correct?


587) All alums contain:


588) Moderate electrical conductivity is shown by


589) The molecules of aluminium chloride in vapour state:


590) Semi water gas is mixture of :


591) Borax bead test is not given by:


592) The correct order of increasing atomic radii, is


593) Boric acid is not used:


594) Identify the statement that is not correct as far as structure of diborane is concerned


595) Which of the following is amphoteric?


596) Which of the following is not an ionic trihalide?


597) Which of the following processes does not involve a catalyst?


598) The metal which does not form a polynuclear carbonyl is :


599) Tetra ethyl lead is used as:


600) Which of the following statement is correct with respect to the property of elements in the carbon family with an increase in the atomic number? Their


601) The chemical formula of phosgene or carbonyl chloride is:


602) Which is not a mineral of aluminium?


603) Graphite is soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite.


604) The stability of hydrides of carbon family is in the order


605) Which does not react with water?


606) The number of electrons present in the valency shell of group 13:


607) Moissan boron is


608) The metallic character of the elements of IV A group or group 14 :


609) Which of the boron compound is optically active?


610) When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain:


611) Foramtion of in-numberable compounds of carbon is due to its


612) Flux is used to


613) Moissan boron is


614) Electrolytic reduction of pure alumina is not possible because:


615) Boric acid is used in carom boards for smooth gliding of pawns because


616) Iodine is decolourised by:


617) Quartz is an example of


618) Which can be directly brought into solid state from gaseous state?


619) In aluminates coordination number of Al is:


620) Thallium shows different oxidation sates because:


621) Al reduces most of the metallic oxides due to its greater affinity for:


622) Water as is


623) Which one is explosive?


624) The inert form of carbon is:


625) Annealing of glass is done to:


626) Calorific value of producer gas is low because of


627) Mark the correct statement:


628) Producer gas is the mixture of


629) In laboratory silicon can be prepared by the reaction


630) Which of the following shows variable valency?


631) Elements of group 13 form oxides of the general formula:


632) Which statement is correct with respect to the property of the elements with increase in atomic number in the carbon family?


633) Alumina on heating with carbon in nitrogen atmosphere gives:


634) Which of the following has the minimum heat of dissociation?


635) Carbon reacts with strong electropositive metal oxides to form:


636) Carbon is soluble in:


637) Tetrahalides of IV A group of group 14 elements are:


638) The percentage of carbon is least in :


639) The most reactive form of carbon is:


640) Which is not used as pigment in paints?


641) Water glass is


642) Aluminium does not react with:


643) Tendency of catenation is strongest in:


644) Carborundum is


645) Which is not an alloy of aluminium?


646) Purification of alumina takes place by


647) Thallium shows different oxidation states because:


648) Thermite a mixture used for welding is:


649) Borax bead test depends on the formation of:


650) The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniform. White metallic tin buttons got converted to grey powder. This transformation is related to


651) The basic structural unit is silicates is


652) Good conductor of heat and current is:


653) Addition of excess of sodium hydroxide solution to stannous chloride solution, we obtain:


654) Ammonical CuCl absorbs:


655) The refractive index of diamond is highest among solids. Its value is:


656) The correct statement with respect to carbon monoxide is:


657) Which element of group 14 forms only one hydride?


658) Highest electronegativity among the following is for:


659) The stability of + 1 oxidation state increases in the sequence:


660) Ultra violet rays are not allowed to pass through:


661) Metal protected by a layer of its own oxide is:


662) The colour of copper metaborate and chromium metaborates are respectively:


663) Which gas is essential constituent of almost all fuel gases?


664) The precious stone aquamarine is:


665) Which metal is an important component of transistors?


666) When Al is added to potassium hydroxide solution:


667) An acid among the following is:


668) CO reacts with chlorine in presence of sunlight to gives:


669) Which is used in high temperature thermometry?


670) Silicon is


671) Which ore is best concentrated by froth floatation process?


672) Buckminster-fullerene is a variety of


673) CO is poisonous gas, antidote for CO poisoning is


674) Commercially important ore of lead is:


675) Difference between diamond and graphite is due to:


676) Which element is used for making a transistor?


677) Which one of the following compounds, is not a protonic acid?


678) Aluminium reacts with nitrogen to form:


679) Al-Bronze contains Al and:


680) Silica is a/an


681) Which one of the following is used as an acid flux in metallurgy?


682) Which one of the following is the correct statement?


683) In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to


684) Which of the following is a mixed oxide?


685) Which metal burn in air at high temperature with the evolution of much heat?


686) Boron when heated with carbon forms


687) Which is a true acid anhydride?


688) Roasted tin stone ore after washing with water is known as


689) Activation of charcoal:


690) Compound of lead used in match industry is:


691) Which gas has more percentage in coal gas?


692) A particular elements belongs to group 13 and II period of the periodic table. It is:


693) In graphite, the sheets are held by :


694) Stable compounds in +1 oxidation state are formed by:


695) Which of the following is a good conductor of heat and electricity?


696) Which element occurs in free state?


697) C and Si belong to IV group or group 14. The maximum coordination number of carbon in commonly occurring compounds is 4, whereas that of silicon is 6. This is due to :


698) Pyrene (a fire extinguisher) is:


699) Which does not exist?


700) The reducing power of divalent species decreases in the order :


701) The hardest substance amongst the following


702) The hybridization of carbon in carbon monoxide is:


703) Newly shaped glass articles when cooled suddenly become brittle, therefore these are cooled slowly, this process is known as:


704) Aluminium carbide reacts with dil. HCl to give:


705) The blue coloured mineral 'Lapis Lazuli' used as semiprecious stone is:


706) The correct order of decreasing hardness of the following compounds is:


707) It is impossible to fuse strips of copper, silver or iron into soda glass because of a difference in the properties of glass and the metal. The property concerned is:


708) The catalyst used in Friedel-Craft's reaction is:


709) The metal used in acid storage batteries is:


710) In Hall's process, the ore is mixed with:


711) Sesquioxide of lead is:


712) Tin (IV) chloride (anhydrous) can be obtained:


713) What product is formed on heating lead nitrate?


714) Which of the following imparts green colour to flame:


715) Destructive distillation of coal does not gives:


716) Red lead is an example of


717) Cassiterite is an ore of


718) Hoope's process is used in the refining of:


719) Boron compounds behave as Lewis acid because of their:


720) Which is pseudo solid?


721) The number of carbon compounds is very large because it:


722) Which species does not exist?


723) Boron halides behave as Lewis acids because of their ……… nature.


724) Silicones have the general formula


725) Water gas cannot be prepared by a continuous process because:


726) Glass reacts with HF to produce


727) Which glass has the highest percentage of lead?


728) Diamond and graphite both are made of carbon atoms. Diamond is extremely hard whereas graphite is soft. This is because :


729) ……is the byproduct obtained in the Serpeck's process.


730) An ionic compound is:


731) Which one of the following is correct statement?


732) Density is highest for :


733) If the flame of a gas stove burns with yellow tips, the burner must be adjusted to provide:


734) Purification of Al by electrolysis method is called


735) Which element shows more pronounced inert pair effect?


736) Teflon is:


737) The tendency for catenation in Group 14 elements varies in the order


738) Coordination number of aluminium is


739) The approximate composition of soda glass is:


740) Lead pipes are readily corroded by :


741) Monosilane on coming in contact with air burns with a luminous flame producing vortex rings. These rings are of


742) Lapis lazuli is


743) Bone black is an allotrope of :


744) The use of diamond as a gem depends on its:


745) PbO is ……..oxide.


746) Aqueous solution of sodium silicate is:


747) Boron cannot form which one of the following anions?


748) During day time plants absorb:


749) Bucky ball or buck minster fullerene is:


750) Diamond is hard because


751) The process used for purification of bauxite ore containing high silica content as impurity is:


752) Aluminium is mainly extracted from:


753) A metal, M forms chlorides in its +2 and +4 oxidation states. Which of the following statements about these chlorides is correct?


754) Which is not a crystalline form of silica?


755) Which is likely to show inert-pair effect?


756) A potter wishes to make a deep blue glaze. Which one of these available chemicals should be mixed?


757) The bonds present in borazole are: