94420 + Interview Questions in Chemistry in Class 12

1.	An ion is reduced to element when it absorbs 6xx 10 ^20 electrons. The number of equivalent of ion is :
Answer» 0.1 0.01 0.001 0.0001 Answer :C

Discussion

2.	An ioinic compound is expected to have tetrahedral structure if r_(+)//r_(-) lies in the range of
Answer» 0.155 to 0.225 0.732 to 1 0.414 to 0.732 0.225 to 0.414 Answer :D

Discussion

3.	An iodized salt contains 0.5% of NaI. A person consumes 3 gm of salt everyday. The number of iodide ions going into his body everyday is (I =127 )
Answer» `10^(-4)` `6.02xx10^(-4)` `6.02xx 10^(19)` `6.02xx 10^(23)` Answer :C

Discussion

4.	An invert sugar is
Answer» isorotatory dextrorotatory laevorotatory optically inactive Answer :C

Discussion

5.	An internal nuclephilic substitution reaction involves the
Answer» COMPLETE RETENTION Complete inversion Formation of RACEMIC mixture Change in Absolute CONFIGURATION ANSWER :A

Discussion

6.	An intimate mixture of ferric oxide (Fe_(2)O_(3)) and aluminium (Al) is used as solid rocket fuel. Calculate fuel value per gram and fuel value per c c of the mixture. Heats of formation and densities are as follows : DeltaH_(f)(Al_(2)O_(3))=399"kcal//mole" DeltaH_(f)(Fe_(2)O_(3))=199"kcal//mole" Density of Fe_(2)O_(3)=5.2 g// c c Density of Al =2.7 g// c c
Answer» Solution :Given that, (i) `2Al+3//2O_(2) to Al_(2)O_(3),DeltaH=-399 "kcal"` (ii) `2Fe+3//2O_(2) to Fe_(2)O_(3),DeltaH=-199 "kcal"` Applying the inspection METHOD, [Eqn. (i)-Eqn.(ii], we get, `2Al+Fe_(2)O_(3) to Al_(2)O_(3)+2Fe, DeltaH=-399-(-199)=-200"kcal"` Now, 2 moles of AL weigh `(2xx27), i.e., 54 g and 1 MOLE of `Fe_(2)O_(3)` weighs 160g. Total weight of the MIXTURE `=54+160=214 g. `:.` fuel value per gram of the mixture `=(200)/(214)=0.9345 "kcal/g"` Further, volume of 2 moles of `Al=(54)/(2.7)=20 c c` and volume of 1 mole of `Fe_(2)O_(3)=(160)/(5.2)=30.76 c c`. `:.` total volume of the mixture`=50.76 c c` `:.` fuel value per c c of the mixture `=(200)/(50.76)` `=3.94 "kcal/ c c"`

Discussion

7.	An interhalogen compound is:
Answer» `IF_5` `I_3^-` `CN^-` `(CN)_2` ANSWER :A

Discussion

8.	An insulstor oxide is:
Answer» CuO CoO `Fe_2O_3` All Answer :D

Discussion

9.	An insulated container of gas has two chambers separated by an insulating partition. One of the chambers has volume V_(1) and contains ideal gas at pressure P_(1) and temperature T_(1). The other chambers has volume V_(2) and contains ideal gas at pressure P_(2) and temperature T_(2). If the partion is removed without doing any work on the gas, the final equilibrium temperature of the gas in the container will be
Answer» <P>`(T_(1)T_(2)(P_(1)V_(1)+P_(2)V_(2)))/(P_(1)V_(1)T_(2)+P_(2)V_(2)T_(1))` `(P_(1)V_(1)T_(1)+P_(2)V_(2)T_(2))/(P_(1)V_(1)+P_(2)V_(2))` `(P_(1)V_(1)T_(2)+P_(2)V_(2)T_(1))/(P_(1)V_(1)+P_(2)V_(2))` `(T_(1)T_(2)(P_(1)V_(1)+P_(2)V_(2)))/(P_(1)V_(1)T_(1)+P_(2)V_(2)T_(2))` ANSWER :A

Discussion

10.	An insulator oxide is:
Answer» CuO CoO `Fe_2O_3` All Answer :D

Discussion

11.	An insoluble coloured compound formed by action of metallic salts on dyes is known as
Answer» LAKE MORDANT DYE intermediate None of these Solution :The PROCESS is CALLED lake.

Discussion

12.	An insulator is :
Answer» SILICON Graphite Aluminium Diamond Answer :D

Discussion

13.	An inorganic substance givesbalckppt in group II whichis dissolve inaqua regainEvapotate off aqus regain anddiluteit with water .To this few dropof ammonium thiocyanateandsodiumacelete followedby Co(NO_(3))_(2) are added .A deepbluecolour or ppt .is obtained .Thisis due to presence of
Answer» `HG^(2+)` `BI^(3+)` `Pb^(2+)` `Cd^(2+)` ANSWER :a

Discussion

14.	An inorganic salt when heated with concentrated H_(2)SO_(4) evolves a colourless pungent smelling gas but with concentrated H_(2)SO_(4) and MnO_(2) evolves a coloured pungent smelling gas which bleaches moist litmus paper.The coloured gas is:
Answer» `NO_(2)`<BR>`Cl_(2)` `Br_(2)` `I_(2)` SOLUTION :`Cl^(-)+H_(2)SO_(4) to HCl uarr ("colourless") +HSO_(4)^(-)` `MnO(OH)_(2)+2H_(2)SO_(4)+2Cl^(-) to Mn^(2+) +Cl_(2) uarr ("yellowish green")+2SO_(4)^(2-)+3H_(2)O` `Cl_(2)+H_(2)O to 2HCl+[O]` `Cl_(2)` is a yellowish green gas which bleaches LITMUS paper by oxidation.

Discussion

15.	An inorganic sodium salt (A) gives two colourless gases (B) and (C ) leavinga residue (D). B turns white copper sulphate blue, while C turns lime water milky and then colourless. The residue solid (D) when heated strongly gives substance (E) and (F). E gives white precipitate with BaCl_(2). F when treated with dil. HCl gives a gas (G), which when passed through a solution of SO_(2) gives a yellow precipitate due to (H). Identify A to H with proper reasoning.
Answer» SOLUTION :`A=NaHSO_(3),B=H_(2)O,C=SO_(2),D=Na_(2)SO_(3),E=Na_(2)SO_(4),F=Na_(2)S,G=H_(2)S,H=S`

Discussion

16.	An inorganic solid (A) dissolve in watger to give acid B and acid C. A also reacts with aqueous alkali to form two salts in solution. The salt solution gives white precipitates with both AgNO_(3) and BaCl_(2) solutions. What is A?
Answer» SOLUTION :`SO_(2)Cl_(2)`

Discussion

17.	An inorganic salt when heated evolves a coloured gas which bleaches moist litmus paper. The evolved gas is
Answer» `NO_(2)` `Cl_(2)` `Br_(2)` `I_(2)` SOLUTION :`Cl_(2)` isa greenish YELLOW gas which BLEACHES LITMUS paper by oxidaiton `Cl_(2)+H_(2)O to 2HCl +[O]` Litmus +[O] `to` colourless oxidised from

Discussion

18.	An inorganic salt when heated evolves coloured gas which bleachesmoistlimus paper .The evolves gas is
Answer» `NO_(2)` `SO_(2)` `N_(2)O` `I_(2)` Solution :Some nitrates on heating GIVE `NO_(2)` whichbleaches moist LITMUS paper due to its oxidising NATURE

Discussion

19.	An inorganic salt when heated evolves a colourless gas which bleaches moist litmus paper. The evolved gasis :
Answer» `Br_2` `Cl_2` `NO_2` `I_2`. SOLUTION :`Cl_2` BLEACHES moistlitmus PAPER .

Discussion

20.	An inorganic salt solutionpaires on treatment with HCI will not give a white precipitate of whichmetal ions?
Answer» `Hg_(2)^(2+)` `Hg^(2+)` `Zn^(2+)` `Al^(3+)` Solution :`HgCI_(2)` is INSOLUBLE

Discussion

21.	An inorganic salt solution on treatment with HCl gives a white ppt. Which of the following metal ions is possible?
Answer» `Hg_(2)^(2+)` `Hg^(2+)` `Zn^(2+)` `CD^(2+)` Solution :`Hg_(2)^(2+)` (ous) IONS from `Hg_(2)Cl_(2)` (WHITE PPT).

Discussion

22.	An inorganic salt on analysis gave the following percentage composition : Pb=62.6,N=8.4,O=29 What is empirical formula of the compound ? Also name the compound, (At. Mass Pb = 207, N = 14, O = 16).
Answer» Solution :`PbN_(2)O_(6).PB(NO_(3))_(2)," Lead NITRATE"`

Discussion

23.	An inorganic salt solution on treatment with HCI gives a white ppt. Which of the following metal ions is possible?
Answer» `Hg_(2)^(2+)` `HG^(++)` `Zn^(++)` `CD^(++)` Solution :`Hg_(2)^(2+)` (OUS) ion forms `Hg_2 Cl_2` insoluble white ppt.

Discussion

24.	An inorganic salt (A) is decomposed on heating to give two products (B) and (C). Compound (C) is a liquid at room temperature and is neutral to litmus while compound (B) is a colourless neutral gas. Compounds (A), (B) and (C) are
Answer» `NH_(4)NO_(3), N_(2)O, H_(2)O` `NH_(4)NO_(2), NO, H_(2)O` `CAO, H_(2)O, CaCl_(2)` `BA(NO_(3))_(2), H_(2)O, NO_(2)` SOLUTION :`underset((A))(NH_(4)NO_(3))OVERSET(Delta)rarr underset((B))(N_(2)O) + underset((C))(2H_(2)O`

Discussion

25.	An inorganic salt is heated with ethyl alcohol and conc, H_(2)SO_(4), vapours evolved produces greenedged flame on ignition, it indicates the presence of:
Answer» `F^(-)` `C_(2)O_(4)^(2-)` `BO_(3)^(3-)` `CIO_(3)^(-)` Answer :C

Discussion

26.	An inorganic salt is heated with ethyl alcohol and . cone. H_2SO_4, vapours evolved produces green-edgedflame on ignition , It indicates the presence of :
Answer» `F^-` `C_2O_4^(2-)` `BO_3^(3-)` `CIO_3^-` ANSWER :C

Discussion

27.	An inorganic Lewis acid (X) shows the following reactions : An acidic solution of (X) does not give a precipitate with H2S. Identify (X) and give chemical equation for steps (i) to (iii) .
Answer» SOLUTION :`X-AlCl_(3)` `AL(OH)_(3)+NaOH RARR underset("Solube")(NaAlO_(2)+)2H_(2)O`

Discussion

28.	An inorganic red coloured compound (A) on heating gives a compound (B) and a gas (C). (A) on treatment with dil. HNO_(3) gives compound (D), brown colour substnace (E) and a neutral oxide (F). Compound (D)on warming gives off again gas (C). Then, (E) will be
Answer» `Mn_(3)O_(4)` `PbO_(2)` `Pb_(3)O_(4)` `Fe_(2)O_(3)` Answer :B

Discussion

29.	An inorganic salt (A) is decomposed at about 523K to give products (B) and (C). Compound (C) is a liquid at room temperature and is neutral to litmus paper while compound (B) is used in dental surgery for anesthesia purpose. Compounds (A),(B),(C) wll be identified as-
Answer» `NH_(4)NO_(3),N_(2)O,H_(2)O` `NH_(4)NO_(2),N_(2),H_(2)O` `CaCO_(3),CaO,H_(2)O` NH_(4)Cl, NH_(3),HCL` Answer :A

Discussion

30.	An inorganic lewise acid (X) fumes in moist air, andintensity offumesincreases when a red dippole in NH_(4)OH is thrugh tnear to it .An acidicsolution of (X) on additionofNH_(4)CI and NH_(4)OHgives a percipitate which dissolvein NaOH solution .An acidic, solution of (X) does notgiveprecipitate with H_(2)S Hence , the compound (X) is
Answer» `FeCI_(3)` `AICI_(3)` `SnCI_(2)` `ZnCI_(2)` Solution :`(X)` is `AICI_(3)` `UNDERSET("Mostone")(AICI_(3)) + 3H_(2)O rarr AI(OH)_(3) darr + underset(("Fumes"))(3HCI) ` `AICI_(3)+3NH_(4)OH rarr AI(OH)_(3) darr + 3NH_(4)CI` `AI(OH)_(3) + NAOH rarr NaAIO_(2) + 2H_(2)O` `AICI_(3) + H_(2)S + H^(o+) rarr` No ppt

Discussion

31.	An inorganic Lewis acid (X) fumes in moist air and intensity of fumes increases when a rod dipped in NH_(4)OH is brought near to it. An acidic solution of) on addition of NH_(4)Cl and NH_(4)OH.gives a precipitate which dissolves in NaOH solution. An acidic solution of (X) does not give precipitate with H_(2)S. Hence, the compound is
Answer» `FeCl_(3)` `AlCl_(3)` `SnCl_(2)` `ZnCl_(2)` Solution :`(X) is `AlCl_(3)` `AlCl_(3)underset(moisture)(+3H_(2)O)toAl(OH)_(2)darrunderset(fumes)(+3HCL)` `AlCl_(3)+3NH_(4)OHtoAl(OH)_(3)darr+3NH_(4)Cl` `AL(OH)_(3)+NaOHtoNaAlO_(2)+H_(2)O` `AlCl_(3)+H_(2)S+H^(+)to"No ppt."` HENCE,(B) is the CORRECT answer.

Discussion

32.	An inorganic iodide (A) on heating gives gases (B) and (C). (B) is neutral towards litmus while (C) is acidic (B) gives back dense white fumes of (A) when cooled with (C). (A) functions as a strong acid in water. (C) is also obtained by action of (D) on water. (D) can be obtained when (B) reacts with I_(2) in presence of anhydrous CaCl_(2). (B) is poisonous, has smell of rotten fish and it is sparingly soluble in water. Now answer the following question What is true compound (D) ?
Answer» The oxidation number of CENTRAL atom of (D) is + IV Compound (D) produces a yellow precipitate with silver nitrate solution Compound (D) DISSOLVES in water forming an acid which with sodium HYDROXIDE forms three series of salts Both (B) and (C) ANSWER :D

Discussion

33.	An inorganic iodide (A) on heating gives gases (B) and (C). (B) is neutral towards litmus while (C) is acidic (B) gives back dense white fumes of (A) when cooled with (C). (A) functions as a strong acid in water. (C) is also obtained by action of (D) on water. (D) can be obtained when (B) reacts with I_(2) in presence of anhydrous CaCl_(2). (B) is poisonous, has smell of rotten fish and it is sparingly soluble in water. Now answer the following question The compound (A)
Answer» turns moist RED litmus blue reacts completely with water is used as a DEHYDRATING agent All of these Answer :B

Discussion

34.	An inorganic compound X reacts with water to form two cid Y and Z. X also reacts with NaOH to form two salts B and C which remain in solution. The solutions gives white precipitate with both AgNO_(3) and BaSO_(4) solutions. What is X
Answer» `SO_(2)Cl_(2)` `AlCl_(3)` `SbCl_(3)` `PCl_(3)F_(2)` Answer :A

Discussion

35.	An inorganic iodide (A) on heating gives gases (B) and (C). (B) is neutral towards litmus while (C) is acidic (B) gives back dense white fumes of (A) when cooled with (C). (A) functions as a strong acid in water. (C) is also obtained by action of (D) on water. (D) can be obtained when (B) reacts with I_(2) in presence of anhydrous CaCl_(2). (B) is poisonous, has smell of rotten fish and it is sparingly soluble in water. Now answer the following question Select the correct statement from the following for the gas (B)
Answer» It PRODUCES dense white FUMES with `HCl` It produces dense violet fumes on combustion It produces dense white fumes with `BF_(3)` It can act as oxidising agent Answer :C

Discussion

36.	An inorganic compound (X) made up of two most occurring elements in the earths crust and used in building construction . When (X ) reacts with carbon . It forms a posionous gas (Y) which is most stable diatomic molecule . Identify compounds (X ) and (Y) .
Answer» `SiO_2 ,CO_2` `SI,CO_2` `SiO_2,CO` `Si,CO` ANSWER :C

Discussion

37.	An inorganic compound ( X ) gives brick red flame test and also gives following observations. (i) Produce smell of chlorine in moist air (ii) Produce brown coloration with CH_(3)COOH and KI (iii) Produce an anasthetic compound with ethanol What is the formula of compoundby the reaction (X ) and C_(2) H_(5) OH
Answer» `CHCl_(3)` `CH_(3)Cl` `C C l_(4)` `C_(2) H_(5) Cl` Solution :`CaOCl_(2) +H_(2) O rarrCa(OH)_(2) + Cl_(2)` `C_(2)H_(5) OH + Cl_(2) RARR CH_(3) CHO + 2HCl` `CH_(3)CHO + 3Cl_(2) rarr C Cl_(3) CHO + 3HCl` `2C C l_(3) CHO + Ca(OH)_(2) rarr 2CHCl_(3) + (HCOO)_(2)Ca`

Discussion

38.	An inorganic compound ( X ) gives brick red flame test and also gives following observations. (i) Produce smell of chlorine in moist air (ii) Produce brown coloration with CH_(3)COOH and KI (iii) Produce an anasthetic compound with ethanol Metal ion which is present in (X ) is
Answer» `Ba^(+2)` `Sr^(+2)` `CA^(+2)` `Na^(+)` Solution :`Ca^(+2)` IONS give brick red colour to FLAME.

Discussion

39.	An inorganic compound ( X ) gives brick red flame test and also gives following observations. (i) Produce smell of chlorine in moist air (ii) Produce brown coloration with CH_(3)COOH and KI (iii) Produce an anasthetic compound with ethanol What is oxidation state of chlorine in compound ( X )
Answer» `+1` `-1` Both `+1` and -1 Zero Solution :In moist air BLEACHING powder give chlorine Smell due to available chlorine `CaOCl_(2) +CO_(2)("of air") rarr CaCO_(3) + Cl_(2) uarr` `underset("(Bleaching powder)")(CaOCl_(2)) rarr CA^(+2) + underset("-1)")(Cl ^(-)) +underset((+1))( OCl^(-1))`

Discussion

40.	An inorganic compound which on heating first melts, then solidifies and liberates O_(2) gas the inorganic compound is
Answer» `Al_(2)O_(3)` `KMnO_(4)` `MnO_(2)` `KClO_(3)` Solution :`underset("SOLID")(2KClO_(3))OVERSET("HEAT")underset("melts")RARR underset("solid")(2KCl)+3O_(2)`

Discussion

41.	An inorganic compound producing organic compound on heating is:
Answer» Sodamide Ammonium cyanate Sodalime Potassium cyanide Answer :B

Discussion

42.	An inorganic compound gives off O_2 when heated, turns an acid solution of Kl violet, and reduces acidified KMnO_4. The compound is :
Answer» `SO_3` `KNO_3` `H_2O_2` All of these Answer :C

Discussion

43.	An inorganic compound first metls then resolidifies and then liberates a gas. It may be
Answer» `MnO_(2)` `Al_(2)O_(3)` `KMnO_(4)` `KClO_(3)` SOLUTION :`2KClO_(3) to 2KCL +3O_(2)`

Discussion

44.	An inorganiccompound[A] yellowish greenin colour loses its water of crystallisation upon heating . When heatedfurthr, it changesto blackish brown powder [B] and alsogives two oxides of sulphure. The power [B] on boilingwithhydrochloric acidgiven a yellowish solution which gives a bloodred colouration on reacting with potassiumthiocyanate. Theyellowishgreen compound [A] is
Answer» `CuSO_(4). 5H_(2)O` `FeSO_(4).7H_(2)O` `FeSO_(4).(NH_(4)) SO_(4). 6H_(2)O` `Fe_(2)(SO_(4))_(3).7H_(2)O` Solution :(b) The compound [A] is sulphate of some metal as it give two OXIDES of sulphur `(SO_(2)" and "SO_(3))` on HEATING. Its yellowish green colour suggests that (A) if `FeSO_(4).7H_(2)O` (green vitriol).

Discussion

45.	An inorganic compound first melts then resoldifies and then liberates a gas. It may be:
Answer» `KClO_3` `KMnO_4` `Al_2O_3` `MnO_2` ANSWER :A

Discussion

46.	An inorganic compound A when heated decomposes completely to give only two gases B and C . B is neutral gas , fairly soluble in water and itself decomposes on heating to two different gases D and E . A when warmed with NaOH gives another gas F which when passed through CuSO_4 solution gives a deep blue colour. Identify A .
Answer» `NH_4 NO_3` `AgNO_3` `CU(NO_(3))_(2)` `PB(NO_(3))_(2)` Solution :`A = NH_(4) NO_(3) , B = N_2 O , C = H_2 O , D = N_2 , E = O_2 , F = NH_3` `NH_(4) NO_(3) to N_2 O + 2H_2 O , 2 N_(2) O overset("heat")(to) 2 N_2 + O_(2)` `NH_(4)NO_(3) + NaOH to NaNO_(3) + NH_(3) +H_(2)O`

Discussion

47.	An inorganic compound (A) , transparent like glass is a strong reducing agnet. Its hydrolysis in water gives a white turbidity (B). Aqueous solution of (A) gives white precipitate (C ) with NaOH (aq.) which is soluble in excess NaOH (A) reduces cupric chloride to produce purple of cassius. (A) also reduces I_(2) and give chromyl chloride test.
Answer» Solution :(1) Since (A) gives chromyl CHLORIDE test and th, it has `CL^(-)` (2) Since (A) is strong reducing agent So (A) is `SnCl_(2)` (i) `underset("solid (A)") underset("transparent")underset("white")(SnCl_(2))+H_(2)O rarr underset("white turbidity")underset((B))(Sn(OH)_(2))+2HCl` (ii) `underset((A))(SnCl_(2))+4NaOH rarr underset((C ))(Sn(OH)_(2))+2NaCl` `Sn(OH)_(2)+underset("excess")(2NaOH)rarr underset("soluble")(Na_(2)SnO_(2))+2H_(2)O` `(iii) 3SnCl_(2)+2AuCl_(3)rarr 3SnCl_(4)+2Au`( PURPLE of cassius)

Discussion

48.	An inorganic compound (A) that is transparant like glass is strong reducing agent . It hydrolyzes in water to give white turbidity (B). Aqueous solution of A gives white ppt (C) with NaOH which is soluble in excess NaOH. (A)reduces I_2 and give chromyl chloride test A reduces I_2 and gives chromyl chloride test. What will be the product ?
Answer» `SnCl_(2) + HI` `SnCl_(4) + HI` `Sn(OH)Cl+HCl` None Solution :A : gives chromyl CHLORIDE test - should contain chlorine . A - is reducing in nature , so it should be in MINIMUM oxidation STATE. `SnCl_(2)+I_(2)rarrSnCl_(4)+2I^(Theta)`

Discussion

49.	An inorganic compound (A) that is transparant like glass is strong reducing agent . It hydrolyzes in water to give white turbidity (B). Aqueous solution of A gives white ppt (C) with NaOH which is soluble in excess NaOH. (A)reduces I_2 and give chromyl chloride test 'A' will be
Answer» `Sn(OH)_2` `SnCl_2` `SnCl_4` `Na_2CO_3` Solution :A : gives CHROMYL chloride test - should contain CHLORINE . A - is reducing in NATURE , so it should be in minimum OXIDATION state. A - will be `SnCl_2` `UNDERSET(A)(SnCl_2)+2H_2Orarrunderset(B(white"))(Sn(OH)_2)+2HCl`

Discussion

50.	An inorganic compound (A) is formed on passing a gas (B) through a conc. liquor containing Na_(2)S and sodium sulphite.
Answer» Answer :The reactions indicate that the compound (A) is sodium thiosulphate. It is FORMED in STEP (i) by passing GAS (B) which is EITHER `I_(2)`. `Na_(2)S+Na_(2) underset((B))(SO_(3)+I_(2))rarr Na_(2)S_(2)O_(3)+2NaI`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

An ion is reduced to element when it absorbs 6xx 10 ^20 electrons. The number of equivalent of ion is :

An ioinic compound is expected to have tetrahedral structure if r_(+)//r_(-) lies in the range of

An iodized salt contains 0.5% of NaI. A person consumes 3 gm of salt everyday. The number of iodide ions going into his body everyday is (I =127 )

An invert sugar is

An internal nuclephilic substitution reaction involves the

An interhalogen compound is:

An insulstor oxide is:

An insulator oxide is:

An insoluble coloured compound formed by action of metallic salts on dyes is known as

An insulator is :

An inorganic substance givesbalckppt in group II whichis dissolve inaqua regainEvapotate off aqus regain anddiluteit with water .To this few dropof ammonium thiocyanateandsodiumacelete followedby Co(NO_(3))_(2) are added .A deepbluecolour or ppt .is obtained .Thisis due to presence of

An inorganic salt when heated with concentrated H_(2)SO_(4) evolves a colourless pungent smelling gas but with concentrated H_(2)SO_(4) and MnO_(2) evolves a coloured pungent smelling gas which bleaches moist litmus paper.The coloured gas is:

An inorganic solid (A) dissolve in watger to give acid B and acid C. A also reacts with aqueous alkali to form two salts in solution. The salt solution gives white precipitates with both AgNO_(3) and BaCl_(2) solutions. What is A?

An inorganic salt when heated evolves a coloured gas which bleaches moist litmus paper. The evolved gas is

An inorganic salt when heated evolves coloured gas which bleachesmoistlimus paper .The evolves gas is

An inorganic salt when heated evolves a colourless gas which bleaches moist litmus paper. The evolved gasis :

An inorganic salt solutionpaires on treatment with HCI will not give a white precipitate of whichmetal ions?

An inorganic salt solution on treatment with HCl gives a white ppt. Which of the following metal ions is possible?

An inorganic salt on analysis gave the following percentage composition : Pb=62.6,N=8.4,O=29 What is empirical formula of the compound ? Also name the compound, (At. Mass Pb = 207, N = 14, O = 16).

An inorganic salt solution on treatment with HCI gives a white ppt. Which of the following metal ions is possible?

An inorganic salt (A) is decomposed on heating to give two products (B) and (C). Compound (C) is a liquid at room temperature and is neutral to litmus while compound (B) is a colourless neutral gas. Compounds (A), (B) and (C) are

An inorganic salt is heated with ethyl alcohol and conc, H_(2)SO_(4), vapours evolved produces greenedged flame on ignition, it indicates the presence of:

An inorganic salt is heated with ethyl alcohol and . cone. H_2SO_4, vapours evolved produces green-edgedflame on ignition , It indicates the presence of :

An inorganic Lewis acid (X) shows the following reactions : An acidic solution of (X) does not give a precipitate with H2S. Identify (X) and give chemical equation for steps (i) to (iii) .

An inorganic red coloured compound (A) on heating gives a compound (B) and a gas (C). (A) on treatment with dil. HNO_(3) gives compound (D), brown colour substnace (E) and a neutral oxide (F). Compound (D)on warming gives off again gas (C). Then, (E) will be

An inorganic salt (A) is decomposed at about 523K to give products (B) and (C). Compound (C) is a liquid at room temperature and is neutral to litmus paper while compound (B) is used in dental surgery for anesthesia purpose. Compounds (A),(B),(C) wll be identified as-

An inorganic compound X reacts with water to form two cid Y and Z. X also reacts with NaOH to form two salts B and C which remain in solution. The solutions gives white precipitate with both AgNO_(3) and BaSO_(4) solutions. What is X

An inorganic compound (X) made up of two most occurring elements in the earths crust and used in building construction . When (X ) reacts with carbon . It forms a posionous gas (Y) which is most stable diatomic molecule . Identify compounds (X ) and (Y) .

An inorganic compound ( X ) gives brick red flame test and also gives following observations. (i) Produce smell of chlorine in moist air (ii) Produce brown coloration with CH_(3)COOH and KI (iii) Produce an anasthetic compound with ethanol Metal ion which is present in (X ) is

An inorganic compound ( X ) gives brick red flame test and also gives following observations. (i) Produce smell of chlorine in moist air (ii) Produce brown coloration with CH_(3)COOH and KI (iii) Produce an anasthetic compound with ethanol What is oxidation state of chlorine in compound ( X )

An inorganic compound which on heating first melts, then solidifies and liberates O_(2) gas the inorganic compound is

An inorganic compound producing organic compound on heating is:

An inorganic compound gives off O_2 when heated, turns an acid solution of Kl violet, and reduces acidified KMnO_4. The compound is :

An inorganic compound first metls then resolidifies and then liberates a gas. It may be

An inorganic compound first melts then resoldifies and then liberates a gas. It may be:

An inorganic compound (A) that is transparant like glass is strong reducing agent . It hydrolyzes in water to give white turbidity (B). Aqueous solution of A gives white ppt (C) with NaOH which is soluble in excess NaOH. (A)reduces I_2 and give chromyl chloride test 'A' will be

An inorganic compound (A) is formed on passing a gas (B) through a conc. liquor containing Na_(2)S and sodium sulphite.