Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

3601.

Which of the following is true about photchemical smog ?

Answer»

It is REDUCING in nature
It is formed in winter
It is a mixture of SMOKE and fog
It causes irritation in eyes

Answer :D
Discussion
3602.

Write the IUPAC names and hybridisation of the following complexes : (i) [Ni(CN)_(4)]^(2-) (ii) [Fe(H_(2) O)_(6) ]^(2+) (Given : Atomic number Ni= 28, Fe= 26)

Answer»

SOLUTION :(i) `[Ni(CN)_(4) ]^(2-)`
IUP AC name : Tetracyanonickelate(II) ION
HYBRIDISATION : `dsp^2`
(ii) `[Fe(H_2 O)_6]^(2+)`
IUPAC name : HEXAAQUAIRON(II) ion
Hybridisation : `sp^(3)d^(2)`
Discussion
3603.

What type of aldehydes undergo Cannizzaro reaction?

Answer»

Solution :AROMATIC and ALIPHATIC aldehydes which do not contain `ALPHA`-HYDROGENS. For EXAMPLE, benzaldehyde, formaldehyde,2,2-dimethylpropanal, etc.
Discussion
3604.

Which of the following elements is not included in Group-15 ?

Answer»

As
N
Se
Bi

Answer :C
Discussion
3605.

Which one of the following elements constitutes a major impurityin pig iron ?

Answer»

SILICON
OXYGEN
Sulphur
Carbon

ANSWER :D
Discussion
3606.

What happens when chloride, bromide and iodide are separately heated with conc. H_(2)SO_(4)?

Answer»

SOLUTION :a. CHLORIDE gives HCl gas which gives thick white fumes with aqueous AMMONIA.
b. Bromide gives reddish-brown `Br_(2)` vapours.
c. Iodide gives violet vapours of iodine which turns STARCH paper blue.
Discussion
3607.

What happens when (i) PCl_5 is heated ? (ii) H_3PO_3 is heated ? Write the reaction involved.

Answer»

SOLUTION :(i) When `PCl_5` is HEATED , it SUBLIMES but decomposeson STRONGER , heating.
`PCl_5 overset(Delta) to PCl_3 + Cl_2`
(ii) `H_3PO_3` on heating disproportionatesto give orthophosphoric acid and PHOSPHINE .
`4H_3PO_3to 3H_3PO_4 + PH_3`
Discussion
3608.

Which one of the following is used as an free radical initiator in the preparation of polystrene?

Answer»

HYDROGEN PEROXIDE
methyl CHLORIDE
BENZOYL peroxide
Benzyl peroxide

Solution :Benzoyl peroxide
Discussion
3609.

Which of the following order is correct regarding the relative basicity of amines?

Answer»




SOLUTION :`EDG UARR B.C uarr`
Discussion
3610.

The stable +2 ions of lanthanides in aqueous solution are

Answer»

`EU^(2+)`
`Ce^(2+)`
`LU^(3+)`
`FE^(2+)`

Answer :A
Discussion
3611.

Write equation for the preparation of polyacrylonitrile.

Answer»

SOLUTION :
Discussion
3612.

Which of the following is an example of Sandmeyer reaction?

Answer»

`2HCHOoverset(NAOH)rarrCH_(3)OH+HCOONa`


ANSWER :B
Discussion
3613.

What happen when (i) hydrogen sulphide is bubbled through an aqueous solutions of sulphur dioxide. (ii) aqueous ammonia is added dropwise to a solution of copper sulphate till it is in excess. (iii) tin is treated with concentrated nitric acid. (iv) CrCl_(3) solutions is treated with sodium hydroxide and then with hydrogen peroxide. (v) Pb_(3)O_(4) is treated with nitric acid.

Answer»
Discussion
3614.

Which of the substance is purified by sublimation

Answer»

Benzoic ACID
Camphor
Naphthalene
All of these

Solution :Benzoic acid, comphor and naphthalene sublime on heating hence, they are purified by sublimation METHOD.
Discussion
3615.

What happens when acetone react with sodium bisulphite?

Answer»

SOLUTION :
Discussion
3616.

Which of the following is/are pure substance(s)?

Answer»

CuSO4.5H2O
Brass
Diamond
All of these

Answer :C
Discussion
3617.

Which one of the following is present as an active constituent in bleaching powder for bleaching action ?

Answer»

`CaCl_(2)`
`CaOCl_(2)`
`Ca(OCl)_(2)`
`CaO_(2)CL`

Solution :`Ca(OCl)_(2)` is the active constituent of BLEACHING powder.
Discussion
3618.

Which of the following transition in H-atom corresponding to absorption line of highest frequency?

Answer»

n=1 to n=2
n=3 to n=4
n=2 to n=1
n=2 to n=3

Solution :As the VALUE of n increases, the energy of orbit DECREASES. THEREFORE, absorption of energy from n=1 to n=2 will have maximum energy or highest frequency of absorption line. The TRANSITION fromn=2 to n=1 corresponds to emission of energy.
Discussion
3619.

Which of the following shows only one oxidation state in its compounds

Answer»

F
Cl
Br
I

Solution :F shows only - oxidation NUMBER of combined STATE
Discussion
3620.

ul("Calculate") the frequency in s^(-1) of infrated photons that can be absorbed by HD molecule. (If you have been unable to calculate the value for epsilon_(HD) then use 8.000xx10^(-20) the calculation) The allowed electronic energies of H atom of H atom are given by the expression: E=-R_(H)/n^(2), n=1, 2, .... where R_(H)=13.5984 eV and 1 eV=1.602xx10^(-19) J The total energy of H_(2) molecules in its ground state is -31.675 eV, relative to the same refrence as that of hydrogen atom.

Answer»


Answer :`hv=DeltaE`
`DeltaE=E_(v1)-E_(V0)=(3/2-1/2)epsilon_(HD)=epsilon_(HD)`
`hv=epsilon_(HD)rArr v=epsilon_(HD)/h`
From PART `3.1 :`
`epsilon_(HD)=7.5724xx10^(-20) J`
Thus : `v=(7.5724xx10^(-20) J)/(6.6261xx10^(-34) J s)=1.1428xx10^(-14) s`
Discussion
3621.

Tyndall effect is observed only when (i) the diameter of the dispersed particles is not much smaller than the wavelength of the light used. (ii) the refractive indices of dispersed phase and dispersion medium differ greatly in magnitude . (iii) the size of the particles is generally between 10^(-11) and 10^(-9) m in diameter. (iv) the dispersed phase and dispersion medium cna be seen separately in the system .

Answer»

(i) and (III)
(i) and (IV)
(II) and (iii)
(i) and (ii)

ANSWER :D
Discussion
3622.

What happens when: (i) Ferric chloride is added to potassium ferrocynide. (ii) Iron reacct with cold dilute nitric acid. (iii) Potassium ferricyanide is added to ferrous sulphate. (iv) Excess of potassium iodide is added to mercuric chloride. (v) Silver choloride is treated with aq. Sodium cyanide and the product thus formed is allowed to react with zinc in alkaline medium.

Answer»

Solution :(i) Prussian blue is formed.
`4FeCl_(3) + 3K_(4)Fe(CN)_(6) to Fe_(4)[Fe(CN)_(6)]_(3) + 12KCl`
Prussian blue (Ferric Ferrocyanide)
(ii) Ammonium nitrate is formed:
`[Fe + 2HNO_(3) to Fe(NO_(3))_(2) + 2H] xx 4`
`HNO_(3) + 8H to NH_(3) + 3H_(2)O`
`NH_(3) + HNO_(3) to NH_(4)NO_(3)`
________________________
`4Fe + 10 HNO_(3) to 4Fe(NO_(3))_(4) + NH_(4)NO_(3) + 3H_(2)O`
_____________________________
(iii) Ferrous ion is first oxidation to ferric ion while ferricyanide ion is reduced to ferrocyanide ions to form potassium ferric ferrocyanide (Tumbull.s blue)
`Fe^(2+) + [Fe(CN)_(6)]^(2-) to Fe^(+3) + [Fe(CN)_(6)]^(4-)`
`K^(+) + Fe^(3+) + [Fe(CN)_(6)]^(4-) to K^(+)Fe^(+3)[Fe(CN)_(6)]^(4-)`
Potassium ferricferrocyanide (Tumbull.s blue)
(IV) First scarlet precipitate is formed then dissolves in excess of potassium iodide forming a complex.
`HCl_(2) + 2Kl to Hgl_(2) + 2KCl`
`Hgl_(2) + 2Kl to K_(2)Hgl_(4)`
Potassium tetraiodo mercurate (colorless)
(v) AgCl dissolves in KCN forming a complex, potassium argento CYANIDE. The addition of ZINC precipitate silver.
`AgCl + 2KCN to KAg(CN)_(2) + KCl`
`2KAg(CN)_(2) + Zn to K_(2)Zn(CN)_(4) + 2Ag`
(Potassium Zinocyanide).
Discussion
3623.

Which ismost reactivechemically ?

Answer»

BA
CA
SR
MG

ANSWER :A
Discussion
3624.

Which of the following forms black ppt. with H_(2)S in acidified solution?

Answer»

`Mg^(2+)`
`Na^(+)`
`Cd^(2+)`
`Zn^(2+)`

SOLUTION :Sulphidesof salts gives BLACK ppt in acidic medium are HgS, CUS, PbS, `Na_(2)S` etc.
Discussion
3625.

The vapour pressure of a given liquid will increase if

Answer»

TEMPERATURE is increased
Surface area of liquid is increased
Volume of liquid in the CONTAINER is increased
Volume of the VAPOUR phase is decreased

Answer :A
Discussion
3626.

What is Ammonia leaching

Answer»

Solution :When a crushed ore containg nickel ,COPPER and cobalt is treated with aqueous ammonia under suitable pressure,ammonia selectively leahes these metal by FORMING their soluble complexes VIZ.`[Ni(NH_(3))_(6)]^(2+),[Cu(NH_(3))_(5)H_(2)O]^(3+)` respectively from the ore leaving behind the GANGUE,iron (III) oxides/hydroxides and aluminosilicate.
Discussion
3627.

Which among the following statements are correct with respect to adsorption of gases on a solid ? 1. The extent of adsorption is equal to k P ^(n) according to Freundlich isotherm. 2. The extent of adsorption is equal to k P^(1//n) according to Freundlich isotherm. 3. The extent of adsorption is equal (1+b P)//aP according to Langmuir isotherm. 4. The extent of adsorption is equal to a P (1+b P) according to Langmuir isotherm. 5. Freundlich adsorption isotherm fails at low pressure.

Answer»

1 and 3
1 and 4
2 and 3
2 and 4

Solution :According to FREUNDLICH isother, `x/m=kP^(1//n)`
According to Langmuir ISOTHERM,` x/m=(aP)/(1+bp).`
Discussion
3628.

The structural form of a compound A(C_(6)H_(11)N) is resolvable, dissolve in dil.HCl and reacts with HNO_(3). Compound a could be

Answer»

`a`.
`B`.
`C`.
`d`.

SOLUTION :CHIRAL compound can be resolvable
Discussion
3629.

What is colour change whenCuSO_(4)*5H_(2)O is strongly heated :-

Answer»
Discussion
3630.

Which of thefollowingstatement(s) is /aretrue ?

Answer»

`wedge_(Na^(+))^(@)` and `wedge_(CI^(-))^(@)`are limitinmolarconductivity of sodiumand CHLORIDE IOINS RESPECTIVELY
`E_(m)^(@)=lambda_(Na^(+))^(@)+ lambda_(CI^(-))^(@)`
`E_(m)^(2)=v_(+)lambda_(Na^(+))^(@)+V_(lambda)`
all of the above

Solution :`wedge_(Na^(+))^(@)`and `wedge_(CI^(-))^(@)`are limitingmolar conductivity of sodium and chloride ion respectively
`E_(m(NaCI))^(@)=wedge_(Na^(+))^(@)+wedge_(CI^(-))^(@)`
and `E_(m)^(@)=V_(m)wedge_(+)^(@)+ V_(wedge_(-))^(@)`
Discussion
3631.

Which one of the following gases, if present in the atmosphere darkens the surface painted by white lead ?

Answer»

`SO_(2)`
`H_(2)S`
`NH_(3)`
`CO_(2)`

SOLUTION :Due to the formation of PBS.
Discussion
3632.

Which of the following is more stable complex and why? [Co(NH_3)_6]^(3+) and [Co(en)_3]^(3+).

Answer»

SOLUTION :`[CO(EN)_3]^(3+)`: Because (en) is a chelating LIGAND/bidentate ligand.
Discussion
3633.

What is the percentageoflanthanoid metal in mischmetall?

Answer»

0.9
0.2
0.05
0.95

Solution :Mischmetall consists of LANTHANOID METAL
`(~95%)` and IRON `(~5%)` and TRACES of S, C, Ca and AL.
Discussion
3634.

What is the chemical name of (i) vitamin E and (ii) vitamin C ?

Answer»

SOLUTION :(i) TOCOPHEROL
(II) ASCORBIC ACID.
Discussion
3635.

Which is high spin complex :

Answer»

`CoCl_(6)^(3-)`
`FeF_(6)^(3-)`
`Co(NH_(3))_(6)^(3_+)`
`[NI(CN)_(4)]^(2-)`

SOLUTION :Both `F^(-)` and `Cl^(-)` are WEAK fields ligands. But `NH_(3)` and `CN^(-)` are STRONG field ligands regrouping occurs in the later two compounds.
Discussion
3636.

What will be the product when an organic compound not containing any ring or tripple bond having molecular formula C_(4)H_(5)Cl undergo polymerisation?

Answer»

Neoprene
Natural rubber
Buna - S
Buna - N

Answer :A
Discussion
3637.

Which of the following bicarbonate can exist in solid state :-

Answer»

`LiHCO_(3)`
`MG(HCO_(3))_(2)`
`Zn(HCO_(3))_(2)`
`KHCO_(3)`

Solution :NA, K, Rb and Cs bicarbonate EXIST in solid STATE rest all are exist in liquid state
Discussion
3638.

Which of the following statement is wrong for gases ?

Answer»

Gases do not have a definite shape and VOLUME
Volume of the GAS is EQUAL to the volume of CONTAINER confining the gas
Confined gas exerts uniform pressure on the WALLS of its container in all directions.
Mass of gas cannot be determined by weighing a container in which it is enclosed.

Answer :D
Discussion
3639.

Which of the following is characteristic of an oil in water type of emulsion

Answer»

both oil and water are DISPERSED phases 
water is dispersed phase 
both oil and water are dispersion MEDIA 
Oil is dispersed phase 

ANSWER :D
Discussion
3640.

Which of the statements about "Denaturation" given below are correct ? (i) Denaturation of proteins causes loss of secondary and tertiary structures of the proetin. (ii) Denaturation leads to the converstion of double strand of DNAinto single strand.

Answer»

(i) and (III)
(II) and (iii)
(i) and (ii)
(i) , (ii) , (iii)

ANSWER :C
Discussion
3641.

When a copper rod is dipped in aqueous silver nitrate solution , the colour of the solution changes to blue . This is because

Answer»

CU is more easily reduced than Ag
Ag is more easily reduced than Cu
Nitrate ion ACTS as an oxidizing AGENT
Nitrate ion acts as a reducing agent

SOLUTION :
Discussion
3642.

Which is wrong in case of enzyme catalysis ?

Answer»

Enzymes work BEST at an OPTIMUM temperature
Enzymes work at an optimum pH
Enzymes are HIGHLY SPECIFIC for substrates
An enzyme raises activation energy

Answer :D
Discussion
3643.

Which of the following will give dye test :

Answer»

Aniline
Methylamine
DIPHENYL AMINE
ETHYLAMINE

ANSWER :A
Discussion
3644.

Which of the following is not a pi-bonded complex?

Answer»

FERROCENE
Zeise SALT
Dibenzene chromium
Tetraethyl LEAD

ANSWER :A
Discussion
3645.

Why activated charcoal is a better adsorbent than ordinary charcoal ?

Answer»

Solution :ACTIVATED charcoal has a larger SURFACE area than ORDINARY charcoal. SINCE adsorption is a surface phenomenon, activated charcoal is a better ADSORBENT than ordinary charcoal.
Discussion
3646.

Which of the following has highest bond strength?

Answer»

HI
HCl
HF
HBr

ANSWER :C
Discussion
3647.

Under constant presure, a certain gas at 0^(@)C was cooled until its volume as reduced to one-half. The temperature at this stage is :

Answer»

0 K
`-136.5K`
`-273^(@)C`
`-136.5^(@)C`

SOLUTION :`T_(2) = ( V_(2) T_(1))/( V_(1)) = ( V//2xx 273)/( V ) = 136.5K`
or `- 136.5^(@)C`
Discussion
3648.

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne

Answer»

`NaNH_2`
HCL
`O_2`
`Br_2`

Solution :1-Butyne and 2-Butyne are distinguish by `NaNH_2` because 1-Butyne REACT with `NaNH_2` due to ACTIVE HYDROGEN
Discussion
3649.

Which of the following does not react with fluroine.

Answer»

KR
Ar
Xe
All

Answer :B
Discussion
3650.

Which is not an alloy of aluminium :

Answer»

Magnalium
Duralumin
German SILVER
ALUMINIUM bronze

Answer :C
Discussion