94420 + Interview Questions in Chemistry in Class 12

1.	In H_2S, S atom is......hybridized
Answer» SP `sp^(2)` `sp^(3)` `DSP^(2)` ANSWER :C

Discussion

2.	In H_3PO_3
Answer» Each HYDROGEN atom is ATTACHED to oxygen Two hydrogen ATOMS are attached to oxygen atoms One atom of h is attached to oxygen None Answer :B

Discussion

3.	In [(H_(2)O)_(4)Co-(O-O)-Co (H_(2)O)_(4)] CL_(5) complex, Co has t_(2g)^(6)e_(g^(0)) configuration, this complex is :
Answer» diamagnetic PARAMAGNETIC oxidation STATE of `CO` is `+2` NONE of these Solution :`O_(2)^(-)` is paramagnetic.

Discussion

4.	In H_(2)O_(2) molecule, the angle between the two O-H planes is
Answer» `90^(@)` `101^(@)` `103^(@)` `105^(@)` SOLUTION :`H_(2)O_(2)` contain bond angle between two O-H planes about `90^(@)`

Discussion

5.	In H_2-O_2 fuel cell the reaction occurring at cathode is
Answer» `H_((aq))^(+) + OH_((aq)) to H_2O_((l))` `H + e^(-)to 1//2 H_2` `O_(2(g)) + 2H_2O_((l)) + 4e^(-) to 4OH_((aq))` `2H_(2(l)) + O_(2(g)) to 2H_2O_((l))` SOLUTION :At anode , `2H_2(g) + 4OH^(-) (aq) to 4H_2O (l) +2e^(-)` At cathode : `O_2(g) + 2H_2O (l) + 4e^(-) to 4OH^(-) (aq)` OVERALL REACTION : `2H_2(g) + O_2(g) to 2H_2O (l)`

Discussion

6.	In H_(2) - O_(2) fuel cell the reaction occuring at cathode is
Answer» `2 H_(2) + O_(2) to 2 H_(2) (L)` `H^(+) + OH^(-) to H_(2)O` `O_(2) + 2 H_(2)O + 4e^(-) to 4OH^(-)` `H^(+) + E^(-) to (1//2) H_(2)` Solution :In `H_(2) - O_(2)` FUEL cell , the reaction at cathode is `O_(2) + 2 H_(2)O + 4 e^(-) to 4 OH^(-)` .

Discussion

7.	In H_(2)-O_(2) fuel cell the electrodes are made up of __________.
Answer» GRAPHITE POROUS graphite metallic ZINC strip metallic COPPER strip Answer :B

Discussion

8.	In H_2 - O_2 fuel cell the reaction occur at cathode is …………… .
Answer» `O_2(G) + 2H_2O (l) + 4E^(-) to 4OH^(-)(aq) ` `H^+(aq) + OH^(-) (aq) to H_2O(l)` `2H_2(g) + O_(2)(g) to 2H_2O(g)` `H^+ + E^(-) to 1//2 H_2` Answer :A

Discussion

9.	In H_(2)-O_(2)fuel cell the electrodes are made of
Answer» graphite POROUS graphite carbon all these Solution :Porous graphite-Adsorption of `H_(2)O_(2)`.

Discussion

10.	In H_(2)-O_(2) fuel cell the reaction occur atcathode is
Answer» `O_(2)(g)+2H_(2)O(L)+4e^(-) rarr 4OH^(-)(aq)` `H^(+)(aq)+OH^(-)(aq) rarr H_(2)O(l)` `2H_(2)(g)+O_(2)(g) rarr 2H_(2)O(g)` `H^(+)+e^(-) rarr 1/2H_(2)` Answer :A

Discussion

11.	In H_(2) -O_(2) fuel cell , combustion of H_(2) occurs to
Answer» generate heat CREATE P.D. between two electrodes . produce high purity WATER ABSORBS heat Solution :It is a FACT for fuel CELL .

Discussion

12.	In H-atom electron jumps form 3 to 2 energy level, the energy released is
Answer» `3.03xx10^(-19)` J/atom `1.03xx10^(-19)` J/atom `3.03xx10^(-12)`J/atom `6.06xx10^(-19)`J/atom Solution :`DeltaE` (energy RELEASED)`=E_(3)-E_(2)` `=-1311.6/(3^(2))-(-1311.8)/(2^(2))` kJ MOL `=1311.8(1/4-1/9)XX(10^(3))/(602xx10^(23))` J/atom `=3.03xx10^(-19)`J/atom

Discussion

13.	In gt C = O group sigma bond is formed by
Answer» <P>`sp^(2)`- p - OVERLAPPING `sp^(3)` - p- overlapping sp-p- overlapping s-p-overlapping Answer :A

Discussion

14.	In group IIB of basic radicals, the yellow ppt. are given by
Answer» `As^(3+)` `SB^(3+)` `SN^(4+)` `Sn^(2+)` Answer :A::C

Discussion

15.	In group V ,(NH_(4))_(2)CO_(3) is addedto precipitate out the carbonate Na_(2)CO_(3) is notaddedbecause
Answer» `CaCO_(3)` is SOLUBLE in `NaCO_(3)` `MgCO_(3)` will be PPT outin group V `Na_(2)CO_(3)` increases the solublityof group Vcarbonates All Answer :d

Discussion

16.	In gruop VIA or group 16, Polonium is metallic while all other elements are ..............
Answer» SOLUTION :non-metals

Discussion

17.	In group II, Formqation of whichsh tarbidity ondilation with H_(2)Oindicate Sb^(3+) .
Answer» Solution :`SbCI_(3) +H_(2)O rarr underset("ORANGE")(SbOCI DARR) + 2HCI` `BiCI_(3) + H_(2)O rarr underset(white)(BiOCI darr) + 2HCI` Whiteturbidityis dueto `BiOCI` (white orange tartbidity is due to `SbOCI)`

Discussion

18.	In group 16 the photosensitive elements are
Answer» OXYGEN and Sulphur Oxygen and TELLURIUM SELENIUM and Tellurium Sulphur and Selenium Solution :Se and TE are semiconductors

Discussion

19.	In the ground state of Cr atom(Z=24) ,the total number of orbitals populated by one or more electrons is,
Answer» 14 16 20 15 Answer :D

Discussion

20.	In graphite, electrons are
Answer» LOCALISED on each C-atom localised on everythird C-atom delocalised WITHIN the layer present in anti-bonding ORBITAL Answer :C

Discussion

21.	In graphite, electrons are:
Answer» Localized on each carbon atom Spread out between the sheets Localized on EVERY third carbon atom Present in antibonding orbital Answer :B

Discussion

22.	In graph of atomic volume versus atomic weight , the elements corresponding to peaks in the curve belong to
Answer» GROUP 1 Group 18 Group 4 Group 14 Answer :A

Discussion

23.	In graphite crystal, carbon is:
Answer» sp-hybridised `sp^2-hybridised` `sp^3-hybridised` None Answer :B

Discussion

24.	In Goldsmith thermite process reductant in
Answer» Coke Aluminium WATER gas CO Answer :B

Discussion

25.	In Goldsmith thermite process, element undergoing oxidation is
Answer» CHROMIUM Manganese Chromium and Manganese Aluminium ANSWER :D

Discussion

26.	In Goldschmidt aluminothmic process, thermite mixture contains x-parts of Fe_(2)O_(3) and one part of aluminium x is
Answer» Solution : In thermite PROCESS a mixture of aluminium powder and `Fe_(2)O_(3)` are in the ratio 1:3 IKNOW as thermite] `:>x=3`

Discussion

27.	In Goldschmidt aluminothermic process, thermite mixture contains:
Answer» 3 parts of `Al_2O_(3)` and 4 parts of AL 3 parts of `Fe_(2)O_(3)` and 2 parts of Al 3 parts of `Fe_(2)O_(3)` and 1 part of Al 1 part of `Fe_(2)O_(3)` and 1 part of Al SOLUTION :In Goldschmidt aluminothermic process, thermite contains 3 parts of `Fe_(2)O_(3)` and 1 part of Al.

Discussion

28.	In Goldschhmidt aluminothermic process, thermite mixture contains :
Answer» 3 Parts `Fe_2O_3` and 2 parts Al 3 Parts `Fe_2O_3` and 4 parts Al 1 Parts `Fe_2O_3` and 1 PART Al 3 Parts `Fe_2O_3` and 1 part Al Answer :D

Discussion

29.	What is Goldschmidt aluminothermic process ?
Answer» 3 PARTS `Fe_2O_3` and 2 parts Al 3 Parts `Al_2O_3` and 4 parts Al 1 Parts `Fe_2O_3` and 1 parts Al 3 Parts `Fe_2O_3` and 1 parts Al Answer :D

Discussion

30.	In Gold Schmidt reaction , certain metallic oxides are reduced to the metallic state by heating with :
Answer» METALLIC aluminium Metallic magnesium Metallic iron Sodium metal Answer :A

Discussion

31.	In going down from top to bottom in Group 16.
Answer» Stability of +6 OXIDATION state DECREASES and that of +4 increases. Stability of both +6 and +4 oxidation state increases. Stability of both +6 and +4 oxidation state decreases. Stability of +6 oxidation state increases and that of +4 decreases. Solution :Stability of +6 oxidation state decreases and that of +4 increases.

Discussion

32.	In glycine the basic group is
Answer» `-NH_2` `-NH_3^+` (-COOH) `-COO^-` ANSWER :A

Discussion

33.	In glycine the basic group is :
Answer» `-NH_(2)` `-COOH` `-COO^(-)` `-NH_(3)^(+)`. Answer :C

Discussion

34.	In glycerine,
Answer» one `1^@`OH group is present one `2^@` OH group is present two `2^@` OH groups are present one `3^@` OH group is present Solution :`HOCH_2overset(*)CH(OH)CH_2OH` is a glycerine `*` MARK carbon atom is secondary carbon atom

Discussion

35.	In given nuclear reaction ._(20)^(49)Ca(alpha,p)rarrX, then identify element X.
Answer» `._(22)^(52)TI` `._(21)^(52)SC` `._(23)^(54)V` `._(19)^(48)K` Solution :`._(20)^(49)CA+._(2)^(4)He rarr._(21)^(52)Sc+._(1)^(1)p`

Discussion

36.	In given graph element-M form which types of sulphate:-
Answer» `M_(2)SO_(4)` `MSO_(4)` `M_(2)(SO_(4))_(3)` `M_(3)(SO_(4))_(2)` ANSWER :B

Discussion

37.	In given compounds how many have Z configuration along double bond ?
Answer» ANSWER :1 (II)

Discussion

38.	In given compounds how many can show geometrical isomerism : ,
Answer» ANSWER :4 (I, II,III, IV)

Discussion

39.	In general, two types of oxy-acids formed by elements of nitrogen family are____and _____.
Answer» Solution :Ous. ACIDS and .ic. acids (LIKE HNO_2 (NITROUS acid), `H_3PO_3` (PHOSPHORUS acid), `HNO_3`(nitric acid), `H_3PO_4` (PHOSPHORIC acid etc)

Discussion

40.	In general, the transition elements exhibit their highest oxidation state in their compounds with elements like :
Answer» C S S and P F and O Answer :D

Discussion

41.	In general the rate of a given reaction can be increased by all the factors except
Answer» Increasing the temperature Increasing the CONCENTRATION of reactants Increasing the ACTIVATION ENERGY USING a positive catalyst Answer :C

Discussion

42.	In general it is observed that the rate of a chemical reaction doubles with every 10 degree rise in temperature. If the generalization holds good for the reaction in the temperature range 295 K to 305 K, what would be the value of activation energy for this reaction ? [R = 8.314 mol^(-1)JK^(-1)]
Answer» Solution :`log.(K_(1))/(K_(2)) = (E)/(2.303 R)[(T_(2)-T_(1))/(T_(1) XX T_(2))]` `log.(2)/(1) = (E_(a))/(2.303 xx 8.314)[(305-295)/(295 xx 305)]` `0.3010 = (E_(a))/(19.14714)[(10)/(89975)]` `E_(a) = (0.3010 xx 19.147 xx 89975)/(10)` `E_(a) = 51906 J MOL^(-1)` `= 51.906 KJ//mol`

Discussion

43.	In general formulaof amines. Ifn = 3theaminemay be .
Answer» `1^(0) and 2^(0)` `1^(0) and 3^(0)` `2^(0) and3^(0)` all of these Answer :D

Discussion

44.	In general interhalogen compound are more reactive than halogens (expect fluorine )
Answer» SOLUTION : `X-x BOND in interhalogen is weaker than X-X or X.X or X. in HALOGENS EXCEPT F-F bond .

Discussion

45.	In Gattermann reaction, a diazonium group is replaced by X using Y. X and Y are
Answer» `{:(X,Y),(CL^(Ө),Cu//HCL):}` `{:(X,Y),(Cl^(o+),CuCl_2 //HCl):}` `{:(X,Y),(Cl^(Ө),CuCl_2 //HCl):}` `{:(X,Y),(Cl_(2),Cu_2 O//HCl):}` ANSWER :A

Discussion

46.	In Gattermann reaction for preparation of chlorobenzene from diazonium salt, the catalyst used is
Answer» `CuCl_(2)` Cu `Cu_(2)O` `CuSO_(4)` SOLUTION :`C_(6)H_(5)N_(2)Cl+overset(HCl)UNDERSET(Cu)toC_(6)H_(5)Cl+N_(2)+CuCl`

Discussion

47.	With the help of resonance show that aryl halides are lesser reactive than alkyl halides.
Answer»

Discussion

48.	In Gatterman -Koch reaction , benzene is converted to benzaldehyde. The set of chemicals used for the convertion
Answer» `CO,HCL, `ANHYDROUS CuCl `CrO_3 (CH_3CO)_2)` ` C_6H_5MgBr,C_2H_5OC_2H_5` `CO_2,HCl, `anhydrous `AlCl_3` Answer :A

Discussion

49.	In gases, the extent of adsorption always increases with increase in pressure.
Answer»

Discussion

50.	In gaseous state , the correct basic strength among the following is
Answer» ` (C_2H_5)_3 N gt (C_2H_5)_2 NH gt C_2H_5NH_2 gt NH_3` ` (C_2H_5)_2NHgt (C_2H_5)_3N gt C_2H_5NH_2gt NH_3` ` (C_2H_5)_2NH gt C_2H_5NH_2 gt (C_2H_5)_3N gt NH_3` ` (C_2H_5)_3N gt C_2H_5NH_2gt (C_2H_5)_2NH gt NH_2` ANSWER :A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In H_2S, S atom is......hybridized

In H_3PO_3

In [(H_(2)O)_(4)Co-(O-O)-Co (H_(2)O)_(4)] CL_(5) complex, Co has t_(2g)^(6)e_(g^(0)) configuration, this complex is :

In H_(2)O_(2) molecule, the angle between the two O-H planes is

In H_2-O_2 fuel cell the reaction occurring at cathode is

In H_(2) - O_(2) fuel cell the reaction occuring at cathode is

In H_(2)-O_(2) fuel cell the electrodes are made up of __________.

In H_2 - O_2 fuel cell the reaction occur at cathode is …………… .

In H_(2)-O_(2)fuel cell the electrodes are made of

In H_(2)-O_(2) fuel cell the reaction occur atcathode is

In H_(2) -O_(2) fuel cell , combustion of H_(2) occurs to

In H-atom electron jumps form 3 to 2 energy level, the energy released is

In gt C = O group sigma bond is formed by

In group IIB of basic radicals, the yellow ppt. are given by

In group V ,(NH_(4))_(2)CO_(3) is addedto precipitate out the carbonate Na_(2)CO_(3) is notaddedbecause

In gruop VIA or group 16, Polonium is metallic while all other elements are ..............

In group II, Formqation of whichsh tarbidity ondilation with H_(2)Oindicate Sb^(3+) .

In group 16 the photosensitive elements are

In the ground state of Cr atom(Z=24) ,the total number of orbitals populated by one or more electrons is,

In graphite, electrons are

In graphite, electrons are:

In graph of atomic volume versus atomic weight , the elements corresponding to peaks in the curve belong to

In graphite crystal, carbon is:

In Goldsmith thermite process reductant in

In Goldsmith thermite process, element undergoing oxidation is

In Goldschmidt aluminothmic process, thermite mixture contains x-parts of Fe_(2)O_(3) and one part of aluminium x is

In Goldschmidt aluminothermic process, thermite mixture contains:

In Goldschhmidt aluminothermic process, thermite mixture contains :

What is Goldschmidt aluminothermic process ?

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

In going down from top to bottom in Group 16.

In glycine the basic group is

In glycine the basic group is :

In glycerine,

In given nuclear reaction ._(20)^(49)Ca(alpha,p)rarrX, then identify element X.

In given graph element-M form which types of sulphate:-

In given compounds how many have Z configuration along double bond ?

In given compounds how many can show geometrical isomerism : ,

In general, two types of oxy-acids formed by elements of nitrogen family are____and _____.

In general, the transition elements exhibit their highest oxidation state in their compounds with elements like :

In general the rate of a given reaction can be increased by all the factors except

In general it is observed that the rate of a chemical reaction doubles with every 10 degree rise in temperature. If the generalization holds good for the reaction in the temperature range 295 K to 305 K, what would be the value of activation energy for this reaction ? [R = 8.314 mol^(-1)JK^(-1)]

In general formulaof amines. Ifn = 3theaminemay be .

In general interhalogen compound are more reactive than halogens (expect fluorine )

In Gattermann reaction, a diazonium group is replaced by X using Y. X and Y are

In Gattermann reaction for preparation of chlorobenzene from diazonium salt, the catalyst used is

With the help of resonance show that aryl halides are lesser reactive than alkyl halides.

In Gatterman -Koch reaction , benzene is converted to benzaldehyde. The set of chemicals used for the convertion

In gases, the extent of adsorption always increases with increase in pressure.

In gaseous state , the correct basic strength among the following is

In general, two types of oxy-acids formed by elements of nitrogen family areand _.