Practice Test


Q1) Which of the following statement is not true both for B and Al? Show Answer


Q2) In which of the following elements + 1 oxidation state is more stable than +3 ? Show Answer


Q3) Which of the following is used in high temperature thermometry? Show Answer


Q4) Which of the following element is present most abundant in the earth's crust? Show Answer


Q5) Which of the following is a Lewis acid? Show Answer


Q6) Boron compound behave as Lewis acid because of their Show Answer


Q7) The purification method of bauxite containing iron oxide as impurity is known as Show Answer


Q8) Which of the following imparts green color to the burner flame ? Show Answer


Q9) What is molecular formula of Borazole ? Show Answer


Q10) Thermite is a mixture of iron oxide and Show Answer


Q11) Which of the following is not a protonic acid ? Show Answer


Q12) The pair of amphoteric hydroxide is Show Answer


Q13) Which of the following is not correct with regard to the structure of diborane ? Show Answer


Q14) Which of the following mineral does not contain Al ? Show Answer


Q15) Which is true for an element R present in group 13 of the period table ? Show Answer


Q16) Which is the most amphoteric ? Show Answer


Q17) Which of the following statement is not true about potash alum? Show Answer


Q18) Aluminium is most abundant in earth's crust, yet it is obtained from bauxite because Show Answer


Q19) Corundum is Show Answer


Q20) Purification of aluminium by electroytic refining is known as Show Answer


Q21) Which one of the following is used to remove silicon dioxide in the Serpeck's process of purification of bauxite ? Show Answer


Q22) Corundum is an ore of Show Answer


Q23) In Hall's process, the main reagent is mixed with Show Answer


Q24) 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? Show Answer


Q25) The chief ore of Al is Show Answer


Q26) Which one of the following has the lowest m.pt.? Show Answer


Q27) Alum is not used Show Answer


Q28) Which of the following statement is incorrect ? Show Answer


Q29) Aluminium(III) chloride forms a dimer because Show Answer


Q30) Which out of the following is potash alum? Show Answer


Q31) Which of the following is not a Lewis acid ? Show Answer


Q32) The aqueous solution of potash alum is Show Answer


Q33) Aluminium reacts with concentrated HCl and Concentrated NaOH to liberated the gases...................respectively Show Answer


Q34) A layer of coke is spread over bauxite during extraction of aluminium. This acts as a/an Show Answer


Q35) Which one of the following element is non-metal? Show Answer


Q36) In diborane the two H-B-H angles are nearly Show Answer


Q37) Which metal is protected by a layer of its own oxide? Show Answer


Q38) Aluminium becomes passive in Show Answer


Q39) Action of caustic soda with soda on aluminium hydroxide gives a compound having formula Show Answer


Q40) Aluminium reacts with caustic soda to form Show Answer


Q41) 'Thermite ' is a mixture of X parts of ferric oxide and Y parts of aluminium powder. X and Y respectively are Show Answer


Q42) Which of the following is the electron deficient molecule ? Show Answer


Q43) Which one is metaboric acid ? Show Answer


Q44) Which of the following does not give a borax bead test? Show Answer


Q45) In a molecule of diborane Show Answer


Q46) Which of the following ions does not exist in an aqueous solution? Show Answer


Q47) Among the following, which show the correct order of magnitude of inert-pair effect ? Show Answer


Q48) Orthoboric acid contains Show Answer


Q49) Which of the following statement is incorrect? Show Answer


Q50) on hydrolysis, diborane produce Show Answer


Q51) By which of the given reaction boeazine prepared? Show Answer


Q52) Which of the following statement is incorrect ? Show Answer


Q53) Which of the following statement is incorrect Show Answer


Q54) The reducing power of Al, Ga, In and Tl are in the same order Show Answer


Q55) Aluminium chloride ionizes in an aqueous solution because Show Answer


Q56) Which of the following metal does not show an inert - pair effect? Show Answer


Q57) Molecular weight of anhydrous aluminium chloride is Show Answer


Q58) Borax on heating with cobalt oxide forms a blue bead of Show Answer


Q59) All alum contains Show Answer


Q60) Which of the following structure correctly represents the boron trifluoride molecule ? Show Answer


Q61) The borax bead is chemically Show Answer


Q62) By which of the following reaction is borazine prepared ? Show Answer


Q63) Chemically borax is Show Answer


Q64) Which of the following structure does not represent the compound given in parenthese ? Show Answer


Q65) Aluminium deposition as vapour on glass form a good mirror, essentially because Show Answer


Q66) When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain Show Answer


Q67) Boric acid is prepared from borax by the action of Show Answer


Q68) Anodised aluminium is Show Answer


Q69) Boric acid is not used as Show Answer


Q70) Alane is chemically Show Answer


Q71) Reactivity of borazole is greater than that of benzene because Show Answer


Q72) Mineral of aluminium that does not contain oxygen is Show Answer


Q73) Which one of following elements has the highest melting point ? Show Answer


Q74) The element which show least metallic character is Show Answer


Q75) Which member of group 13 does not exhibit the group valency in its compounds ? Show Answer


Q76) Group 13 element shows Show Answer


Q77) Which of the following statement is incorrect ? Show Answer


Q78) The melting point of group 13 follows the order Show Answer


Q79) Which of the metal chlorides has maximum covalent character ? Show Answer


Q80) Among the halides of the element of group 13 the one which is most acidic is Show Answer


Q81) Which one of the following oxides is strongly basic ? Show Answer


Q82) The amphoteric oxide from among the following is Show Answer


Q83) The power of halides of boron to act as Lewis acids decrease in the order Show Answer


Q84) Pick up the wrong statement Show Answer


Q85) Which of the following hydroxide is acidic ? Show Answer


Q86) In borax bead test the coloured ions give characteristic colored beads due to formation of Show Answer


Q87) Which of the following is not isomorphous with true alum and is called pseudoalum ? Show Answer


Q88) Which of the following property does not support anomalous behaviour of boron? Show Answer


Q89) 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 Show Answer


Q90) Boric acid is polymeric due to Show Answer


Q91) Which of the following s not Lewis acid ? Show Answer


Q92) Which of the following statement is correct ? Show Answer


Q93) The type of hydridization of boron in diborane is Show Answer


Q94) The hardest compound of boron is Show Answer


Q95) Which of the following is a gas ? Show Answer


Q96) Inorganic benzene is Show Answer


Q97) Which is used as disinfectant? Show Answer


Q98) Which of the following does not have a tetrahedral structure ? Show Answer


Q99) Which of the following statement is false ? Show Answer


Q100) Borax is not used Show Answer


Q101) Aluminothermy used for on the spot welding of large iron structure is based upon the fact that Show Answer


Q102) The chemical formula of bauxite is Show Answer


Q103) Inert pair effect plays an important role in case of Show Answer


Q104) Which of the following is correct statement? Show Answer


Q105) A particular element belong to group 13 and second period of the periodic table, it is Show Answer


Q106) 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 Show Answer


Q107) In the electrolytic extraction of aluminium fused cryolite is added Show Answer


Q108) The chemical composition of cryolite mineral Show Answer


Q109) Which of the following process does not involve a catalyst ? Show Answer


Q110) Aluminium vessels should not be washed with materials containing washing soda since Show Answer


Q111) Aluminium is more reactive than iron but aluminium is less easily corroded than iron because Show Answer


Q112) Which is not a mineral of aluminium ? Show Answer


Q113) Aluminum chloride is a / an Show Answer


Q114) Aluminium oxide is not reduced by chemical reactions since Show Answer


Q115) Alum is a water purifier because it Show Answer


Q116) An example of alum is Show Answer


Q117) Aluminium helps in purifying water by Show Answer


Q118) Aluminium is extracted by the electrolysis of Show Answer


Q119) Heating an aqueous solution of aluminium chloride to dryness will give Show Answer


Q120) ON the addition of mineral acid to an aqueous solution of borax, the following compound is formed Show Answer


Q121) Alum is used by dyers of clothes Show Answer


Q122) In the aluminothermite process, Al acts as a/an Show Answer


Q123) Hydrogen will not reduce Show Answer


Q124) In the electrolysis of aluminium, cryolite is added to Show Answer


Q125) Alumina is Show Answer


Q126) Which is electrophile ? Show Answer


Q127) Moissan Boron is Show Answer


Q128) The chief impurity present in red bauxite is Show Answer


Q129) Which is strong Lewis acid ? Show Answer


Q130) Borax is prepared by treating colemanite with Show Answer


Q131) Galena is an ore of Show Answer


Q132) The halide which is not hydrolysed is Show Answer


Q133) 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)? Show Answer


Q134) Which of the following bonds has the most polar character ? Show Answer


Q135) Which of the following is most dense ? Show Answer


Q136) The oxide which cannot act as reducing agent is Show Answer


Q137) A pseudo solid is Show Answer


Q138) Silicon is an important constituent of Show Answer


Q139) Cassiterite is an ore of Show Answer


Q140) Quartz is crystalline variety of Show Answer


Q141) Mark the oxide which is amphoteric in character Show Answer


Q142) Which one of the following allotropic forms of carbon is isomorphous with crystalline silicon Show Answer


Q143) The element that does not form a monoxide is Show Answer


Q144) Butter of tin is Show Answer


Q145) Which of the following is most stable ? Show Answer


Q146) Thomas slag is Show Answer


Q147) Which of the following has no tin in its composition ? Show Answer


Q148) Which of the following halides is the most stable ? Show Answer


Q149) C and Si have Show Answer


Q150) Silica is soluble in Show Answer


Q151) Carborundum is Show Answer


Q152) The percentage of lead in lead pencil is Show Answer


Q153) Which of the following sulphate is insoluble in water Show Answer


Q154) The metal used for making radiation shield is Show Answer


Q155) The substance used as a smoke screen in warfare is Show Answer


Q156) The sequence of acidic character is Show Answer


Q157) Composition of glass is Show Answer


Q158) Which of the following show bonds in silicones ? Show Answer


Q159) Red lead is Show Answer


Q160) In the manufacture of cement which of the following is used ? Show Answer


Q161) Glass reacts with HF to produce Show Answer


Q162) In laboratory, silicon can be prepared by the reaction of Show Answer


Q163) Which does not exist ? Show Answer


Q164) Which of the following is most electronegative ? Show Answer


Q165) Important ore of lead is Show Answer


Q166) The most stable +2 oxidation state is exhibited by Show Answer


Q167) Water is an important fuel. It is a mixture of Show Answer


Q168) When a mixture of air and steam is passed over red hot coke, the out going gas is Show Answer


Q169) Carbon atoms in diamond are bonded with each other in configuration Show Answer


Q170) Which one of the following characteristic property of carbon ? Show Answer


Q171) Diamond is an example of Show Answer


Q172) Water gas is produced by Show Answer


Q173) Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of Show Answer


Q174) Which of the following has the highest calorific value ? Show Answer


Q175) Which of the following types of forces bind together the carbon atoms in diamond ? Show Answer


Q176) Carbogen is Show Answer


Q177) In graphite, electrons are Show Answer


Q178) Higher percentage of carbon is found in Show Answer


Q179) Diamond and Emerald are formed of Show Answer


Q180) The green house effect is caused by Show Answer


Q181) Which one of the following allotropic forms of carbon isomorphous with crystalline silicon ? Show Answer


Q182) In graphite, the sheets are held by Show Answer


Q183) Graphite is Show Answer


Q184) Pyrosilicate ion is Show Answer


Q185) The variety of glass used in making lenses and prisms is Show Answer


Q186) An alloy of Pb and Sn in equal proportion is called Show Answer


Q187) Graphite is similar to Show Answer


Q188) A fibrous mineral which can withstand red hot flames without any damage is Show Answer


Q189) The stability of the tetrahalides of carbon decrease in the order Show Answer


Q190) Which of the following is most ionic ? Show Answer


Q191) Which of the following metal carbides may be called a methanide? Show Answer


Q192) Carbon -60 contains Show Answer


Q193) Which of the following statement is correct ? Show Answer


Q194) In carbon monoxide molecule, carbon and oxygen are linked by Show Answer


Q195) Which of the following statement is incorrect ? Show Answer


Q196) In carbon -60 all carbon atoms are Show Answer


Q197) Which of the following compounds is used as an abrasive ? Show Answer


Q198) Which of the following is industrial fuel ? Show Answer


Q199) Which of the following oxides of carbon is unstable ? Show Answer


Q200) Chemically zeolites are Show Answer


Q201) lead sugar is Show Answer


Q202) Carbon dioxide is gas but silica is a solid because Show Answer


Q203) Which of the following show bond in silicone Show Answer


Q204) Which element does not exhibit allotropy ? Show Answer


Q205) Semi water gas is a mixture of Show Answer


Q206) Wood charcoal is used in gas masks because it Show Answer


Q207) Aqueous solution of sodium silicate is Show Answer


Q208) Which gas is essential constituent of almost all fuel gases ? Show Answer


Q209) Which gas present in atmosphere darkens the surface painted by white lead ? Show Answer


Q210) Bell metal is an alloy of Show Answer


Q211) Tin plague is the Show Answer


Q212) Which is the least pure form of carbon ? Show Answer


Q213) The component present in greater proportion in water gas is Show Answer


Q214) tin cry refers to Show Answer


Q215) Plumbo-solvency means dissolution of lead in Show Answer


Q216) A reducing agent is Show Answer


Q217) Which oxide has three dimensional structure Show Answer


Q218) Purest form of silica is Show Answer


Q219) Which gas has more percentage in coal gas? Show Answer


Q220) Least stable hydride is Show Answer


Q221) Which is not a allotrope of carbon ? Show Answer


Q222) Which has peroxide linkage ? Show Answer


Q223) Which is not the property of diamond ? Show Answer


Q224) Minium is Show Answer


Q225) Which is not correct? Show Answer


Q226) Litharage is not commonly Show Answer


Q227) Which one of these is acidic ? Show Answer


Q228) Carbon forms a large no. of compound because it has Show Answer


Q229) Ge(II) compounds are powerful reducing agent whereas Pb(IV) compounds are strong oxidants .This can be due to Show Answer


Q230) The composition of the common glass is Show Answer


Q231) The shape of carbon dioxide molecule is Show Answer


Q232) Which of the following combines with haemoglobin of the blood to form caboxyhaemoglobin? Show Answer


Q233) Which of the following is amphoteric ? Show Answer


Q234) Which of the following has maximum bond dissociation energy ? Show Answer


Q235) A gas which burns with blue flame is Show Answer


Q236) Which of the following gases causes pollution when present in the exhaust fumes of vehicles ? Show Answer


Q237) Natural gas is Show Answer


Q238) Lead sulphate is soluble in Show Answer


Q239) Which of the following lead oxides is 'Sindhur'? Show Answer


Q240) Atomic orbitals of carbon involved in diamond structure are Show Answer


Q241) Wood charcoal is used to decolourise sugar because it Show Answer


Q242) In graphite, C atom is in ..................state Show Answer


Q243) An oxide of lead which is used in lead storage batteries , in safety matches and is powerful oxidizing agent is Show Answer


Q244) Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite Show Answer


Q245) Glass is a Show Answer


Q246) 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 Show Answer


Q247) In silicon dioxide Show Answer


Q248) The stability of dihalides of Si, Ge, Sn and Pb increase steadily in the sequence Show Answer


Q249) Carborundum is obtained when silica is heated at high temperature with Show Answer


Q250) Moderate electrical conductivity is shown by Show Answer


Q251) The electronegativity of the following elements increase in the order Show Answer


Q252) The species that does not contain peroxide ions is Show Answer


Q253) Material used in solar cell contain Show Answer


Q254) Which of the following halides is least stable and has double existence ? Show Answer


Q255) Which of the following oxides is neutral ? Show Answer


Q256) In laboratory burners, we use Show Answer


Q257) Which of the following oxide is amphoteric in character ? Show Answer


Q258) A metal M forms chlorides in +2 and +4 oxidation states Which of the following about these chlorides is correct ? Show Answer


Q259) Statement 1 : White phosphorus is stored under water.
Statement 2 : White phosphorus is highly reactive and catches fire spontaneously in air. Show Answer


Q260) 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. Show Answer


Q261) 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. Show Answer


Q262) Statement 1 : Si-Si bonds are weaker than Si-O bonds.
Statement 2 : Silicon forms double bonds with itself. Show Answer


Q263) 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. Show Answer


Q264) Boron nitride on reacting with caustic alkali gives: Show Answer


Q265) The different layers in graphite are held together by Show Answer


Q266) Colemanite is a mineral of: Show Answer


Q267) Which of the following is a mixed oxide? Show Answer


Q268) In the sale of diamonds the unit of weight is carat. One carat is equal to: Show Answer


Q269) Which gas present in atmosphere darkens the surface painted by white lead? Show Answer


Q270) Which of the following is most abundant in the earth crust? Show Answer


Q271) Which form of carbon has a two-dimensional sheet-like structure? Show Answer


Q272) Extraction of metal from the ore cassiterite involves Show Answer


Q273) An alumina-silica clay, called bentonite is dropped from aeroplanes in the slurry form for: Show Answer


Q274) Gun shots are made of lead with a little arsenic. The function of As is to increase: Show Answer


Q275) The glass having smallest coefficient of thermal expansion is : Show Answer


Q276) Tin plague is the: Show Answer


Q277) Water glass is: Show Answer


Q278) If a person is injured by the shot of a gun and all the pellets could not be removed, it may cause poisoning by: Show Answer


Q279) Which property is common in diamond and graphite? Show Answer


Q280) In which of the following the inert pair effect is most prominent? Show Answer


Q281) Which oxide has three dimensional structure? Show Answer


Q282) Diamond and graphite are: Show Answer


Q283) Minium is: Show Answer


Q284) Which of the following is called alum? Show Answer


Q285) The carbon of microphones used in public address systems is : Show Answer


Q286) In Gold Schmidt reaction, certain metallic oxides are reduced to the metallic state by-heating with: Show Answer


Q287) Formula for agate is Show Answer


Q288) Pure CO can be obtained from: Show Answer


Q289) Which is used for the manufacture of optical instruments? Show Answer


Q290) Which element has a limited coordination number of four? Show Answer


Q291) In Goldschmidt aluminothermic process, thermite contains
Show Answer


Q292) During the electrolysis of cryolite, aluminium and fluorine are formed in molar ratio Show Answer


Q293) 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? Show Answer


Q294) Which gas is used in airated water? Show Answer


Q295) Which is not an ore of lead? Show Answer


Q296) Borax on heating with cobalt oxide forms a blue bead of: Show Answer


Q297) Inorganic benzene is: Show Answer


Q298) The correct formula of borax is: Show Answer


Q299) The formula of mineral borax is Show Answer


Q300) The hardest compound of boron is: Show Answer


Q301) 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 Show Answer


Q302) Tin, a silvery white metal exists in: Show Answer


Q303) Which of the following oxide is amphoteric? Show Answer


Q304) Which of the following does not have a tetrahedral structure? Show Answer


Q305) Which of the following oxides is strongly basic? Show Answer


Q306) Aluminium metal is corroded in coastal places near to the sea, because protective oxide film: Show Answer


Q307) The most abundant metal in the earth crust Show Answer


Q308) Which mixed sulphate is not an alum? Show Answer


Q309) In the aluminothermic process, Al acts as a/an Show Answer


Q310) Which is used as control rods in nuclear reactors? Show Answer


Q311) Potash alum is water soluble and ionises in aqueous solution to give: Show Answer


Q312) Lead sugar is: Show Answer


Q313) Which does not exist? Show Answer


Q314) Which form of carbon is used in making boot polish, printing ink, paint and black varnish? Show Answer


Q315) Which of the following shows bond in silicone? Show Answer


Q316) Which of the following organo-silicon compound on hydrolysis will give a three dimensional silicone? Show Answer


Q317) Tin sulphide is: Show Answer


Q318) Lead pipes are not suitable for drinking water because Show Answer


Q319) Aluminium forms: Show Answer


Q320) Which oxidation states are the most characteristics of lead and tin respectively? Show Answer


Q321) The alloy used in preparation of balance beam: Show Answer


Q322) The substance used to impart green colour to glass is: Show Answer


Q323) Which metal powder if spread in air, becomes hazardous? Show Answer


Q324) Crystalline silicon was obtained by: Show Answer


Q325) Aluminium is more reactive than iron but aluminium is less easily corroded than iron because: Show Answer


Q326) Silicon hydrides are named as: Show Answer


Q327) Which compound can make fire proof clothes? Show Answer


Q328) A kettle which becomes furred-up in use has inside it a deposit composed mainly of: Show Answer


Q329) Aluminium is obtained by Show Answer


Q330) Which of the following is not correct in case of boron nitride? Show Answer


Q331) Zn on heating with barium carbonate gives : Show Answer


Q332) Hybridisation of boron in diborane is: Show Answer


Q333) When tin is treated with concentrated nitric acid Show Answer


Q334) The ability of a substance to assume two or more crystalline structures is called: Show Answer


Q335) Glass is soluble in: Show Answer


Q336) Duralumin is an alloy of: Show Answer


Q337) Among the following the purest form of carbon is : Show Answer


Q338) Which of the following anion is present in chain structure of silicate? Show Answer


Q339) Tin reacts with: Show Answer


Q340) Which gas is responsible for green house effect? Show Answer


Q341) Al and Ga have the same covalent radii because of: Show Answer


Q342) Magnalium contains Show Answer


Q343) Crystalline form of silica is called Show Answer


Q344) Borax is prepared by treating colemanite with: Show Answer


Q345) Which is not the property of diamond? Show Answer


Q346) What happens when steam is passed over red hot carbon? Show Answer


Q347) In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to Show Answer


Q348) Purest form of silica is : Show Answer


Q349) Alzeimer's disease is caused due to Al interaction with internal organs of the body if food is contaminated with Al. This disease Show Answer


Q350) Metalloid among the following is: Show Answer


Q351) Alumina may be converted into anhydrous aluminium chloride by: Show Answer


Q352) The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence

Show Answer


Q353) PbO is Show Answer


Q354) Among the following the maximum covalent character is shown by the compound: Show Answer


Q355) Asbestos is chemically: Show Answer


Q356) The structure of diborane contains: Show Answer


Q357) Borax is: Show Answer


Q358) Heating an aqueous solution of aluminium chloride to dryness will give Show Answer


Q359) Hoope's process is used for the purification of the metal Show Answer


Q360) Which of the following is the electron deficient molecule? Show Answer


Q361) 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 : Show Answer


Q362) Which compound is solid? Show Answer


Q363) The first I.P. of Al is smaller than that of Mg because: Show Answer


Q364) Which type of forces bind together the carbon atoms in diamond? Show Answer


Q365) Ordinary glass is: Show Answer


Q366) The common semiconductor is: Show Answer


Q367) Plumbo-solvency means dissolution of lead in: Show Answer


Q368) Which of the following does not exist in free form? Show Answer


Q369) On doping Ge metal with a little of ln, one gets: Show Answer


Q370) Vapour density of which gas is near to air? Show Answer


Q371) Muddy water can be purified through coagulation by using Show Answer


Q372) Carbon monoxide on heating with sulphur gives: Show Answer


Q373) In electrolysis of aluminium oxide which of the following is added to accelerate the process Show Answer


Q374) The most abundant gas in ordinary air among the following is: Show Answer


Q375) Silicon is usually found in: Show Answer


Q376) Corundum is: Show Answer


Q377) Synthetic gas is a mixture of: Show Answer


Q378) Lead pipes can be used for: Show Answer


Q379) The core of a non-luminous Bunsen burner flame is observed to be yellow in colour. This is because of: Show Answer


Q380) Aluminium is not present in which of the following mineral? Show Answer


Q381) The correct order of decreasing ionic nature of lead dihalides is : Show Answer


Q382) Diborane does not undergo cleavage reaction with: Show Answer


Q383) The correct Lewis acid order for boron halides is: Show Answer


Q384) Formula of felspar is Show Answer


Q385) Stannous oxide can be obtained by: Show Answer


Q386) Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of : Show Answer


Q387) The fraction by volume of carbon monoxide in producer gas is about: Show Answer


Q388) Alum is not used: Show Answer


Q389) 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) Show Answer


Q390) Carbon dioxide dissolves under pressure in water to give: Show Answer


Q391) Which fuel has the highest calorific value? Show Answer


Q392) Which of the following is not correct? Show Answer


Q393) The chemical formula of sindhur is Show Answer


Q394) When sand is heated with hydrofluoric acid and a wet rod is brought in contact with vapours evolving a white deposit is due to Show Answer


Q395) Which is not a characteristic property of carbon? Show Answer


Q396) Which of the following is more stable? Show Answer


Q397) The relative Lewis acid character of boron trihalides is in the order Show Answer


Q398) In diborane the two H-B-H angles are nearly Show Answer


Q399) Thermite is a mixture of Show Answer


Q400) Alum is added to muddy water because Show Answer


Q401) White lead or basic lead carbonate is: Show Answer


Q402) Among the various allotropes of carbon : Show Answer


Q403) Oxides of silicon are: Show Answer


Q404) The reducing agent in thermite process is Show Answer


Q405) Man dies in an atmosphere of carbon monoxide, because it: Show Answer


Q406) Which has highest b.p.? Show Answer


Q407) There are two H-bridge bonds in diborane molecule because there are: Show Answer


Q408) Which of the following oxides is amphoteric in character? Show Answer


Q409) Water gas is produced by: Show Answer


Q410) CO forms a volatile compound with: Show Answer


Q411) Which one of the following statements about the zeolite is false? Show Answer


Q412) The order of acidic strength of boron trihalides Show Answer


Q413) Alane is chemically: Show Answer


Q414) Heating an aqueous solution of aluminium chloride to dryness will give: Show Answer


Q415) Buckminster fullerene is Show Answer


Q416) Lead (IV) oxide is obtained by : Show Answer


Q417) Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that, graphite Show Answer


Q418) Aluminium becomes passive in nitric acid because it: Show Answer


Q419) Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is Show Answer


Q420) An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to Show Answer


Q421) Which of the following form dimeric halides? Show Answer


Q422) Aluminium appears like gold when it is mixed with: Show Answer


Q423) The C—X bond energy order for carbon tetra halides is: Show Answer


Q424) An example of a major air pollutant is: Show Answer


Q425) Which of the following is used in making printer's ink, shoe polish, black varnish and paint? Show Answer


Q426) Pewter is an alloy of : Show Answer


Q427) Nickeloy is an alloy containing: Show Answer


Q428) Rose metal is an alloy of: Show Answer


Q429) The hottest part of the Bunsen burner flame is: Show Answer


Q430) An insulator is: Show Answer


Q431) By chlorinating carbon disulphide with chlorine in presence of aluminium chloride, we get: Show Answer


Q432) The element which forms neutral as well as acidic oxides is: Show Answer


Q433) In the alumino-thermic process, aluminium acts as: Show Answer


Q434) Carborundum is the commercial name of : Show Answer


Q435) Which is amphoteric compound? Show Answer


Q436) Diborane reacts with water to form: Show Answer


Q437) Pyrex glass is a mixture of : Show Answer


Q438) Amorphous boron on burning in air forms: Show Answer


Q439) Be and Al exhibits many properties which are similar but the two elements differ is: Show Answer


Q440) What is the state of hybridization of carbon in fullerene? Show Answer


Q441) Boron was isolated by: Show Answer


Q442) Borax bead test is responded by: Show Answer


Q443) Which of the following gives propyne on hydrolysis? Show Answer


Q444) Which has highest bond energy? Show Answer


Q445) Lead may be replaced from its salt solution by: Show Answer


Q446) On the addition of mineral acid to an aqueous solution of borax, the compound formed is: Show Answer


Q447) An aqueous solution of potash alum gives Show Answer


Q448) Unstable lead compounds are Show Answer


Q449) Which is neutral to litmus? Show Answer


Q450) Bell metal is an alloy of : Show Answer


Q451) Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out: Show Answer


Q452) Coke is obtained from coal by: Show Answer


Q453) The liquid field metal expanding on solidification is Show Answer


Q454) Graphite is used in nuclear reactors: Show Answer


Q455) Carbon tetrachloride has zero dipole moment because of: Show Answer


Q456) Massicot is prepared by: Show Answer


Q457) Animal charcoal is used for decolourisation of sugar because: Show Answer


Q458) Pyrosilicate ion is: Show Answer


Q459) What is the number of free electrons present on each carbon atom in graphite? Show Answer


Q460) Diaspora is: Show Answer


Q461) Which of the following reactions occurs at the cathode during the charging of lead accumulator? Show Answer


Q462) The coal form containing maximum percentage of carbon is: Show Answer


Q463) Water softner is Show Answer


Q464) The main constituents of coal gas are: Show Answer


Q465) Carbon dioxide is a gas but silica is a solid because : Show Answer


Q466) Alums are used for Show Answer


Q467) Lead pipes are corroded quickly by Show Answer


Q468) Melting point is highest for: Show Answer


Q469) Purification of alumina is essential because: Show Answer


Q470) Which one shows most pronounced inert pair effect? Show Answer


Q471) Producer gas, a fuel and also a source of nitrogen is obtained by: Show Answer


Q472) Which of the following is an ore of lead? Show Answer


Q473) White lead is Show Answer


Q474) 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 Show Answer


Q475) Anodised aluminium is: Show Answer


Q476) The variety of glass, used for the preservation of eggs is: Show Answer


Q477) Solder is an alloy of lead with Show Answer


Q478) Which of the following is used for making optical instruments? Show Answer


Q479) Tincal is Show Answer


Q480) Tin (II) fluoride (anhydrous) can be obtained by : Show Answer


Q481) Producer gas is a mixture of: Show Answer


Q482) Which statement is false? Show Answer


Q483) Which of the following is the correct statement for red lead? Show Answer


Q484) The formula of potash alum is Show Answer


Q485) Potash alum dissolves in water to give a/an Show Answer


Q486) Which is the least pure form of carbon? Show Answer


Q487) The calorific value of carbon is about ……. kcal. Show Answer


Q488) Aluminium metal is refined by Show Answer


Q489) Which one of the following metals work as a reduction in smelting process? Show Answer


Q490) Which of the following has structure similar to graphite? Show Answer


Q491) Tin (II) chloride (anhydrous) can be obtained: Show Answer


Q492) An element A dissolves both in acid and alkali. It is an example of Show Answer


Q493) Which statement is not true about potash alum? Show Answer


Q494) Which melts in boiling water? Show Answer


Q495) Solder is an alloy of : Show Answer


Q496) Hardest element of III A group of gp.13 is: Show Answer


Q497) Tin cry refers to: Show Answer


Q498) The composition of the common glass is Show Answer


Q499) The method of zone refining of metals is based on the principle of Show Answer


Q500) Feldspar is: Show Answer


Q501) The thermal stability order for group 14 halides is: Show Answer


Q502) Tungsten carbides is an example of: Show Answer


Q503) The hybridization of boron atom in orthoboric acid is: Show Answer


Q504) Which of the following is known as inorganic benzene? Show Answer


Q505) Which is not an allotrope of carbon? Show Answer


Q506) Carbogen is: Show Answer


Q507) Mica is chemically: Show Answer


Q508) The compound used in lead accumulators is: Show Answer


Q509) Which of the following is pseudoalum? Show Answer


Q510) Which element does not exhibit allotropy? Show Answer


Q511) One that marks the paper like lead is: Show Answer


Q512) Carbon monoxide will not reduce: Show Answer


Q513) Graphite is made by heating coke with silica for many hours in a : Show Answer


Q514) Which of the following undergoes sublimation? Show Answer


Q515) Which is used as mordant? Show Answer


Q516) Molecular weight of anhydrous aluminium chloride is: Show Answer


Q517) The elements of IV A group or group 14 have 4 electrons in their outermost orbit. They: Show Answer


Q518) In purification of bauxite by hall's process Show Answer


Q519) Newton's alloy contains : Show Answer


Q520) Boron readily dissolves in: Show Answer


Q521) Which of the following is not a Lewis acid? Show Answer


Q522) The protective film of oxide on the surface of Al metal may be strengthened by: Show Answer


Q523) Sapphire is a mineral of: Show Answer


Q524) Which is/are fire extinguishers? Show Answer


Q525) The borax bead is chemically: Show Answer


Q526) Which of the following is only acidic in nature? Show Answer


Q527) Which poisonous gas is present in the exhaust of car? Show Answer


Q528) A metallic oxide which imparts purple colour to pottery is: Show Answer


Q529) Inorganic benzene is Show Answer


Q530) The cryolite is: Show Answer


Q531) Quartz is made of silicon and oxygen joined in a network arrangement that is similar to : Show Answer


Q532) Eka aluminium is: Show Answer


Q533) Boric acid is prepared from borax by the action of: Show Answer


Q534) The acid used for etching the glass is: Show Answer


Q535) The greatest percentage of CO is in: Show Answer


Q536) The process used for purification of bauxite are containing iron oxide impurity is known as: Show Answer


Q537) Which of the following does not contain silicon? Show Answer


Q538) Which statement is correct? Show Answer


Q539) Which one of the following statements about the zeolites is false? Show Answer


Q540) Least stable hydride is : Show Answer


Q541) Which is true for an element R present in III group of the periodic table? Show Answer


Q542) Which is correct oxidation state of lead? Show Answer


Q543) In III A group, Tl (thalium,) shows +1 oxidation state while other members show +3 oxidation state, why? Show Answer


Q544) Which of the following is a three dimensional silicate? Show Answer


Q545) Hydrogen forms a bridge in the chemical structure of: Show Answer


Q546) Boron differs from the other members of group 13 because it: Show Answer


Q547) Which of the following is a use of alum? Show Answer


Q548) Which fuel has the highest calorific value (kJ/kg)? Show Answer


Q549) Which of the following is a gas? Show Answer


Q550) Lead sulphate is soluble in : Show Answer


Q551) Colour is imparted to glass by mixing: Show Answer


Q552) Dry ice is Show Answer


Q553) Mineral of aluminium that does not contain oxygen is: Show Answer


Q554) Which one of the following ores is best concentrated by froth-floatation method? Show Answer


Q555) Which metal is powdered, suspended in oil and used as paint? Show Answer


Q556) Aqueous solution of potash alum is: Show Answer


Q557) In alumino thermic process, Al is used as Show Answer


Q558) The composition of mica is: Show Answer


Q559) Coal gas: Show Answer


Q560) Lead chromate is……..in colour. Show Answer


Q561) Which halide is least stable and has doubtful existence? Show Answer


Q562) Litharge is not commonly used in : Show Answer


Q563) The precious Ruby stone is: Show Answer


Q564) Wood charcoal is used in gas masks because it: Show Answer


Q565) On strong heating lead nitrate gives: Show Answer


Q566) Which is not correct? Show Answer


Q567) All alums contain: Show Answer


Q568) The molecules of aluminium chloride in vapour state: Show Answer


Q569) Semi water gas is mixture of : Show Answer


Q570) Borax bead test is not given by: Show Answer


Q571) The correct order of increasing atomic radii, is Show Answer


Q572) Boric acid is not used: Show Answer


Q573) Identify the statement that is not correct as far as structure of diborane is concerned Show Answer


Q574) Which of the following is amphoteric? Show Answer


Q575) Which of the following is not an ionic trihalide? Show Answer


Q576) Which of the following processes does not involve a catalyst? Show Answer


Q577) The metal which does not form a polynuclear carbonyl is : Show Answer


Q578) Tetra ethyl lead is used as: Show Answer


Q579) 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 Show Answer


Q580) The chemical formula of phosgene or carbonyl chloride is: Show Answer


Q581) Which is not a mineral of aluminium? Show Answer


Q582) Graphite is soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite. Show Answer


Q583) The stability of hydrides of carbon family is in the order Show Answer


Q584) Which does not react with water? Show Answer


Q585) The number of electrons present in the valency shell of group 13: Show Answer


Q586) The metallic character of the elements of IV A group or group 14 : Show Answer


Q587) Which of the boron compound is optically active? Show Answer


Q588) When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain: Show Answer


Q589) Foramtion of in-numberable compounds of carbon is due to its Show Answer


Q590) Flux is used to Show Answer


Q591) Electrolytic reduction of pure alumina is not possible because: Show Answer


Q592) Boric acid is used in carom boards for smooth gliding of pawns because Show Answer


Q593) Iodine is decolourised by: Show Answer


Q594) Quartz is an example of Show Answer


Q595) Which can be directly brought into solid state from gaseous state? Show Answer


Q596) In aluminates coordination number of Al is: Show Answer


Q597) Thallium shows different oxidation sates because: Show Answer


Q598) Al reduces most of the metallic oxides due to its greater affinity for: Show Answer


Q599) Water as is Show Answer


Q600) Which one is explosive? Show Answer


Q601) The inert form of carbon is: Show Answer


Q602) Annealing of glass is done to: Show Answer


Q603) Calorific value of producer gas is low because of Show Answer


Q604) Mark the correct statement: Show Answer


Q605) Producer gas is the mixture of Show Answer


Q606) In laboratory silicon can be prepared by the reaction Show Answer


Q607) Which of the following shows variable valency? Show Answer


Q608) Elements of group 13 form oxides of the general formula: Show Answer


Q609) Which statement is correct with respect to the property of the elements with increase in atomic number in the carbon family? Show Answer


Q610) Alumina on heating with carbon in nitrogen atmosphere gives: Show Answer


Q611) Which of the following has the minimum heat of dissociation? Show Answer


Q612) Carbon reacts with strong electropositive metal oxides to form: Show Answer


Q613) Carbon is soluble in: Show Answer


Q614) Tetrahalides of IV A group of group 14 elements are: Show Answer


Q615) The percentage of carbon is least in : Show Answer


Q616) The most reactive form of carbon is: Show Answer


Q617) Which is not used as pigment in paints? Show Answer


Q618) Water glass is Show Answer


Q619) Aluminium does not react with: Show Answer


Q620) Tendency of catenation is strongest in: Show Answer


Q621) Which is not an alloy of aluminium? Show Answer


Q622) Purification of alumina takes place by Show Answer


Q623) Thallium shows different oxidation states because: Show Answer


Q624) Thermite a mixture used for welding is: Show Answer


Q625) Borax bead test depends on the formation of: Show Answer


Q626) 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 Show Answer


Q627) The basic structural unit is silicates is Show Answer


Q628) Good conductor of heat and current is: Show Answer


Q629) Addition of excess of sodium hydroxide solution to stannous chloride solution, we obtain: Show Answer


Q630) Ammonical CuCl absorbs: Show Answer


Q631) The refractive index of diamond is highest among solids. Its value is: Show Answer


Q632) The correct statement with respect to carbon monoxide is: Show Answer


Q633) Which element of group 14 forms only one hydride? Show Answer


Q634) Highest electronegativity among the following is for: Show Answer


Q635) The stability of + 1 oxidation state increases in the sequence: Show Answer


Q636) Ultra violet rays are not allowed to pass through: Show Answer


Q637) Metal protected by a layer of its own oxide is: Show Answer


Q638) The colour of copper metaborate and chromium metaborates are respectively: Show Answer


Q639) Which gas is essential constituent of almost all fuel gases? Show Answer


Q640) The precious stone aquamarine is: Show Answer


Q641) Which metal is an important component of transistors? Show Answer


Q642) When Al is added to potassium hydroxide solution: Show Answer


Q643) An acid among the following is: Show Answer


Q644) CO reacts with chlorine in presence of sunlight to gives: Show Answer


Q645) Which is used in high temperature thermometry? Show Answer


Q646) Silicon is Show Answer


Q647) Which ore is best concentrated by froth floatation process? Show Answer


Q648) Buckminster-fullerene is a variety of Show Answer


Q649) CO is poisonous gas, antidote for CO poisoning is Show Answer


Q650) Commercially important ore of lead is: Show Answer


Q651) Difference between diamond and graphite is due to: Show Answer


Q652) Which element is used for making a transistor? Show Answer


Q653) Which one of the following compounds, is not a protonic acid? Show Answer


Q654) Aluminium reacts with nitrogen to form: Show Answer


Q655) Al-Bronze contains Al and: Show Answer


Q656) Silica is a/an Show Answer


Q657) Which one of the following is used as an acid flux in metallurgy? Show Answer


Q658) Which one of the following is the correct statement? Show Answer


Q659) Which metal burn in air at high temperature with the evolution of much heat? Show Answer


Q660) Boron when heated with carbon forms Show Answer


Q661) Which is a true acid anhydride? Show Answer


Q662) Roasted tin stone ore after washing with water is known as Show Answer


Q663) Activation of charcoal: Show Answer


Q664) Compound of lead used in match industry is: Show Answer


Q665) A particular elements belongs to group 13 and II period of the periodic table. It is: Show Answer


Q666) In graphite, the sheets are held by : Show Answer


Q667) Stable compounds in +1 oxidation state are formed by: Show Answer


Q668) Which of the following is a good conductor of heat and electricity? Show Answer


Q669) Which element occurs in free state? Show Answer


Q670) 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 : Show Answer


Q671) Pyrene (a fire extinguisher) is: Show Answer


Q672) Which does not exist? Show Answer


Q673) The reducing power of divalent species decreases in the order : Show Answer


Q674) The hardest substance amongst the following Show Answer


Q675) The hybridization of carbon in carbon monoxide is: Show Answer


Q676) Newly shaped glass articles when cooled suddenly become brittle, therefore these are cooled slowly, this process is known as: Show Answer


Q677) Aluminium carbide reacts with dil. HCl to give: Show Answer


Q678) The blue coloured mineral 'Lapis Lazuli' used as semiprecious stone is: Show Answer


Q679) The correct order of decreasing hardness of the following compounds is: Show Answer


Q680) 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: Show Answer


Q681) The catalyst used in Friedel-Craft's reaction is: Show Answer


Q682) The metal used in acid storage batteries is: Show Answer


Q683) In Hall's process, the ore is mixed with: Show Answer


Q684) Sesquioxide of lead is: Show Answer


Q685) Tin (IV) chloride (anhydrous) can be obtained: Show Answer


Q686) What product is formed on heating lead nitrate? Show Answer


Q687) Which of the following imparts green colour to flame: Show Answer


Q688) Destructive distillation of coal does not gives: Show Answer


Q689) Red lead is an example of Show Answer


Q690) Cassiterite is an ore of Show Answer


Q691) Hoope's process is used in the refining of: Show Answer


Q692) Boron compounds behave as Lewis acid because of their: Show Answer


Q693) Which is pseudo solid? Show Answer


Q694) The number of carbon compounds is very large because it: Show Answer


Q695) Which species does not exist? Show Answer


Q696) Boron halides behave as Lewis acids because of their ……… nature. Show Answer


Q697) Silicones have the general formula Show Answer


Q698) Water gas cannot be prepared by a continuous process because: Show Answer


Q699) Glass reacts with HF to produce Show Answer


Q700) Which glass has the highest percentage of lead? Show Answer


Q701) Diamond and graphite both are made of carbon atoms. Diamond is extremely hard whereas graphite is soft. This is because : Show Answer


Q702) ……is the byproduct obtained in the Serpeck's process. Show Answer


Q703) An ionic compound is: Show Answer


Q704) Which one of the following is correct statement? Show Answer


Q705) Density is highest for : Show Answer


Q706) If the flame of a gas stove burns with yellow tips, the burner must be adjusted to provide: Show Answer


Q707) Purification of Al by electrolysis method is called Show Answer


Q708) Which element shows more pronounced inert pair effect? Show Answer


Q709) Teflon is: Show Answer


Q710) The tendency for catenation in Group 14 elements varies in the order Show Answer


Q711) Coordination number of aluminium is Show Answer


Q712) The approximate composition of soda glass is: Show Answer


Q713) Lead pipes are readily corroded by : Show Answer


Q714) Monosilane on coming in contact with air burns with a luminous flame producing vortex rings. These rings are of Show Answer


Q715) Lapis lazuli is Show Answer


Q716) Bone black is an allotrope of : Show Answer


Q717) The use of diamond as a gem depends on its: Show Answer


Q718) PbO is ……..oxide. Show Answer


Q719) Aqueous solution of sodium silicate is: Show Answer


Q720) Boron cannot form which one of the following anions? Show Answer


Q721) During day time plants absorb: Show Answer


Q722) Bucky ball or buck minster fullerene is: Show Answer


Q723) Diamond is hard because Show Answer


Q724) The process used for purification of bauxite ore containing high silica content as impurity is: Show Answer


Q725) Aluminium is mainly extracted from: Show Answer


Q726) A metal, M forms chlorides in its +2 and +4 oxidation states. Which of the following statements about these chlorides is correct? Show Answer


Q727) Which is not a crystalline form of silica? Show Answer


Q728) Which is likely to show inert-pair effect? Show Answer


Q729) A potter wishes to make a deep blue glaze. Which one of these available chemicals should be mixed? Show Answer


Q730) The bonds present in borazole are: Show Answer


Q731) The correct order of the first ionisation enthalpy is Show Answer


Q732) Given below are two statements.
Statement I Boron is extremely hard indicating its high lattice energy.
Statement II Boron has highest melting and boiling point compared to its other group members. In the light of the above statements, choose the most appropriate answer from the options given below. Show Answer


Q733) Which one of the following elements will remain as liquid inside pure boiling water? Show Answer


Q734) Given below are two statements.
Statement I The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga.
Statement II The d-orbitals in Ga are completely filled.
In the light of the above statements, choose the most appropriate answer from the options given below. Show Answer


Q735) The geometry around boron in the product 'B' formed from the following reaction is Show Answer


Q736) The metal that has very low melting point and its periodic position is closer to a metalloid is Show Answer


Q737) Choose the correct stability order of group 13 elements in their + 1 oxidation state. Show Answer


Q738) In which one of the following molecules strongest back donations of an electron pair from halide to boron is expected? Show Answer


Q739) Given below are two statements:
Statement I Gallium is used in the manufacturing of thermometers.
Statement II A thermometer containing gallium is useful for measuring the freezing point (256 K) of brine solution.
In the light of the above statements. choose the correct answer from the options given below. Show Answer


Q740) Given below are two statements: one is labelled as
Assertion (A) and the other is labelled as Reason (R).
Assertion (A) Melting point of boron (2453 K) is unusually high in group 13 elements.
Reason (R) Solid boron has very strong crystalline lattice.
In the light of the above statements, choose the most appropriate answer from the options given below Show Answer


Q741) The incorrect statement from the following for borazine is Show Answer


Q742) Given below are two statements.
Statement I Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green.
Statement II The green colour observed is due to the formation of copper (I) metaborate.
In the light of the above statements, choose the most appropriate answer from the options given below. Show Answer


Q743) Aqueous solutions of which of the following boron compounds will be strongly basic in nature? Show Answer


Q744) The correct statements among I to III regarding group 13 element oxides are:
I. Boron trioxide is acidic.
II. Oxides of aluminium and gallium are amphoteric.
III. Oxides of indium and thallium are basic. Show Answer


Q745) Which one of the following orders represents the correct sequence of the increasing basic nature of the given oxides? Show Answer


Q746) Among the following, the maximum covalent character is shown by the compound. Show Answer


Q747) Which one of the following is the correct statement? Show Answer


Q748) Heating of an aqueous solution of aluminium chloride to dryness will give Show Answer


Q749) Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in Show Answer


Q750) Alum is widely used to purify water since Show Answer