Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

In which of the following reactions , the stoichiometric ratio of H_(2)SO_(4) " to " H_(2) is the same ?

Answer»

`Zn (s) " and " H_(2)SO_(4)`
NA (s) and `H_(2)SO_(4)`
`Al (s) " and " H_(2)SO_(4)`
Ni(s) and `N_(2)SO_(4)`

Solution :N/A
Discussion
2.

In which of the following reactions, the product is racemic mixture

Answer»




all the above

SOLUTION :
Discussion
3.

In which of the following reactionsthe product is not formed according to Markownikoff's rule-

Answer»

`CH_3CH=CH_2+HCl to`
`CH_3CH=CH_2+HCloverset("PEROXIDE") to`
`CH_3CH=CH_2+HBr to`
`CH_3CH=CH_2+HBroverset("peroxide") to`

ANSWER :D
Discussion
4.

In which of the following reactions , the intermediate species acyl nitene (R-oversetoverset(O)(||)C-ddotN: )and intermediate compound alkyl isocyanate (R-N=C=O) are involved ?

Answer»

`R-oversetoverset(O)(||)C-NH_2overset(Br_2+KOH)tooverset(H_2O)toR-NH_2`
`R-oversetoverset(O)(||)C-NH-OHunderset(H_2O)overset(THETA)overset(OH)tooverset(MeOH)toR-NH-overset(O)overset(||)C-OMe`
`R-oversetoverset(O)(||)C-N_3underset(H_2O)overset(Delta)toR-NH_2`
`R-oversetoverset(O)(||)C-OHunderset(H_2O)overset(HN_3+H^(+))tooverset(H_2O)tooverset(PhOH)toR-NH-oversetoverset(O)(||)C-OPh`

SOLUTION :(A) is Hofmann bromamide REACTION
(B)is Lossen rearreangement reaction
(C )is Curtius REARRANGEMENT reaction
(D) is Schmidt rearrangement reaction
Discussion
5.

In which of the following complexes the metal ion has the lowest ionic radius ?

Answer»

`[Ti(H_(2)O)_(6)]^(2+)`
`[V(H_(2)O)_(6)]^(2+)`
`[Cr(H_(2)O)_(6)]^(2+)`
`[Mn(H_(2)O)_(6)]^(2+)`

ANSWER :B
Discussion
6.

In which of the following reactions, the heat liberated is known as ''heat of combustion''.

Answer»

`H_((AQ))^(+)+OH_((aq))^(-)rarrH_(2)O_((l))+"heat"`
`C("graphite")+(1)/(2)O_(2(G))rarrCO_((g))+"heat"`
`CH_(4(g))+2O_(2(g))rarrCO_(2(g))+2H_(2)O_((l))+"heat"`
`H_(2)SO_(4(aq))+H_(2)O_((l))rarrH_(2)SO_(4(aq))+"heat"`

Answer :C
Discussion
7.

In which of the following complexes the metal ion is in zero oxidation state ?

Answer»

`[Cu(NH_3)_4]Cl_2`
`Zn_2[Fe(CN)_6]`
`Mn_2(CO)_10`
`[Ag(NH_3)_2]Cl`

Answer :C
Discussion
8.

In which of the following reactions the graph of concentration vs time for reactants and products will be difficult to plot.

Answer»

`N_(2)O_(5)(G)rarr2NO_(2)(g)+(1)/(2)O_(2)(g)`
`CH_(3)overset(O)overset(||)C-OCH_(3)(aq)overset([H^(+)])rarrCH_(3)overset(O)overset(||)C-OH+CH_(3)OH`
`H_(2)(g)+(1)/(2)O_(2)(g)rarrH_(2)O(l)`
`H_(2)O_(2)(aq)rarrH_(2)O(l)+(1)/(2)O_(2)(g)`

Answer :B
Discussion
9.

In which of the following complexes, the EAN is NOT equal to the atomic number of Krypton ?

Answer»

`[Co(NH_3)_6]^(3+)`
`[Zn(NH_3)_4]^(2+)`
`[Ni(CO)_(4)]`
`[FE(CN)_6]^(3-)`

Answer :D
Discussion
10.

In which of the following reactions, the forward reaction is favoured by increase of pressure ?

Answer»

`N_(2)+O_(2)hArr 2NO`
`2HI hArr H_(2)+I_(2)`
`2NO_(2)hArr N_(2)O_(4)`
`PCl_(5)hArr PCl_(3)+Cl_(2)`

Answer :C
Discussion
11.

In which of the following complexes of the Co (At. no. 27), will the magnitude of Delta_(a) be the highest ?

Answer»

`[Co(CN)_(6)]^(3-)`
`[Co(C_(2)O_(4))_(3)]^(3-)`
`[Co(H_(2)O)_(6)]^(3+)`
`[Co(NH_(3))_(6)]^(3+)`

Solution :In OCTAHEDRAL COMPLEX the magnitude of `Delta_(a)` will be HIGHEST in a complex having strongest LIGAND. Out of the given ligands `CN^(-)` is strongest. So, `Delta_(a)` will be highest for `[Co(CN)_(6)]^(3-)`. Thus option (a) is correct.
Discussion
12.

In which of the following reactions, the final product is 2-methyl-2-propanol ?

Answer»

`CH_(3)CHO underset((II)H_(3)O^(+))overset((i) CH_(3)MgBr//"DRY ether")RARR`
`CH_(3)CHO underset((ii)H_(3)O^(+))overset((i) C_(2)H_(5)MgBr//"dry ether")rarr`
`CH_(3)COCH_(3) underset((ii)H_(3)O^(+))overset((i) CH_(3)MgBr//"dry ether")rarr`
`CH_(3)COCH_(3) underset((ii)H_(3)O^(+))overset((i) CH_(3)MgBr//"WET ether")rarr`

Answer :C
Discussion
13.

In which of the following complexes, nickel is in the highest oxidation state ?

Answer»

`K_(4)[NI(CN)_(4)]`
`K_(2)NiF_(6)`
`[Ni(CO)_(4)]`
`[Ni(CN)_(4)]^(2-)`.

SOLUTION :Nickel has +4 oxidation STATE.
Discussion
14.

In which of the following reactions, the enthalpy is the least?

Answer»

`CH_(3)COOH+NaOH to CH_(3)COONa+H_(2)O`
`HCl+NH_(4)OH to NH_(4)Cl+H_(2)O`
`HCl+NaOH to NaCl+H_(2)O`
`HCN+NH_(4)OH to NH_(4)CN+H_(2)O`

Solution :In neutralisation REACTION, when acid and base both are WEAK, a large amount of heat is UTILISED to ionise them. THUS, for such reaction, enthalpy of the reaction is least.
Discussion
15.

In which of the following complexes nickel is in the highest oxidation state?

Answer»

`NI(CO)_(4)`
`[Ni(NH_(3))_(6)]Cl_(2)`
`K_(4)[Ni(CN)_(4)]`
`K_(2)NiF_(6)`

Answer :D
Discussion
16.

In which of the following reactions, the concentration of product is higher than the concentration of reactant at equilibrium? (K = equilibrium constant)

Answer»

`MhArrB,K=0.001`
`MhArrN,K=10`
`XhArrY,K=0.005`
`RhArrP,K=0.01`

Solution :For a REACTION, `K_(C)=(["PRODUCT"])/(["Reactant"]),` HENCE,
`If K_(c)lt1,"then [Product]"gt"[Reactant"]`
Discussion
17.

In which of the following complexes more than one type of structural isomers is possible :

Answer»

`[Co(NH_3)_5(NO_2)]Cl`
`[Co(NH_3)_5(H_2O)](NO_2)_3`
`[Pt(NH_3)_4 ] Pt (SCN)_4`
`[Cr(dmg)_3]`

Solution :A`to`lingage , ionisation isomerism
B`to`hydrate, LINKAGE isomerism
C`to` linkage , COORDINATION isomerism
(B)STP REFERS to a TEMPERATURE of 273 K & Nermst EQN. mentioned is at 298 K
(D)`lambda_(mBa(OH_2))^(oo)=lambda_(mBa^(2+))^(oo)+2lambda_(mOH^(-))^(oo)`
Discussion
18.

In which of the following reactions, standard reaction entropy change (DeltaS^(@)) is positive and standard Gibb's energy change (DeltaG^(@)) decreases sharply with increasing temperature

Answer»

`C" graphite"+(1)/(2)O_(2)(g)rarrCO(g)`
`CO(g)+(1)/(2)O_(2)(g)rarrCO_(2)(g)`
`Mg(s)+(1)/(2)O_(2)(g)rarrMgO(s)`
`(1)/(2)C" graphite + "(1)/(2)O_(2)(g)rarr(1)/(2)CO_(2)(g)`

Solution :In the FIRST reaction `C(gr.)+(1)/(2)O_(2)(g)rarrCO(g)DeltaS^(@)=+ve`
THEREFORE `DeltaG^(@)=DeltaH^(@)-TDeltaS` that MEANS the value of `DeltaG` DECREASE on INCREASE on increasing temperature.
Discussion
19.

In which of the following complexes more than one type of structural isomerism is possible ?

Answer»

`[Co(NH_(3))_(5)(NO_(2))]Cl`
`[Co(NH_(3))_(5)(H_(2)O)](NO_(2))_(3)`
`[Pt(NH_(3))_(4)][Pt(SCN)_(4)]`
`[Cr(NH_(3))_(4)(NO_(2))_(2)](NO_(3))_(2)`

Solution :(a) linkage, ionisation (b) linkage, hydrate
(c ) linkage,co-ordination (d) linkage, co-ordiantion
Discussion
20.

In which of the following reactions, SO_(2) acts as an oxidising agent?

Answer»

`I_(2)+SO_(2) +2H_(2)O to SO_(4)^(2-)+4H^(+)+2I^(-)`
`SO_(2)+2H_(2)S to 3S+2H_(2)O`
`3Fe+SO_(2) to FES+2FeO`
`K_(2)Cr_(2)O_(7)+3SO_(2)+H_(2)SO_(4) to Cr_(2)(SO_(4))_(3)+K_(2)SO_(4) +H_(2)O`

Solution :`SO_(2)` oxidizes metals and `H_(2)S. , SO_(2)+H_(2)S^(-2) to 2H_(2)O +3 overset(O)S, 3overset(O)Fe+SO_(2) to 2overset(+2)(FeO)+overset(+2)(FeS)`
Discussion
21.

In which of the following complex the nickel metal is in highest oxidation state?

Answer»

`Ni(CO)_(4)`
`K_(2)NiF_(6)`
`[Ni(NH_(3))_(6)](BF_(4))_(2)`
`K_(4)[Ni(CN)_(6)]`

Answer :B
Discussion
22.

In which of the following reactions, standard reaction entropy change (Delta S^(@)) is positive and standard Gibb's energy (Delta G^(@)) decreases sharply with increasing temperature ?

Answer»

`(1)/(2) C("graphite") + (1)/(2)O_(2)(g) rarr (1)/(2)CO_(2)(g)`
`C("graphite") + (1)/(2)O_(2)(g) rarr CO_(2)(g)`
`CO("graphite") + (1)/(2)O_(2)(g) rarr CO_(2)(g)`
`Mg(s) + (1)/(2)O_(2)(g) rarr MgO(s)`

Solution :`C(s) + (1)/(2) O_(2)(g) rarr CO(g)` Since `DELTA n_(g) (1 - (1)/(2)) = + ve`, `Delta S` is +ve
`Delta G = Delta H - T delta S`
Since, `Delta S` is +ve, increase in temperature will make `T Delta S` more negative and `Delta G` will DECREASE.
Discussion
23.

In which of the following reactions, propanenitrile is obtained as the major product-

Answer»

ethylbromide+alcoholic KCN
propylbromide+alcoholic KCN
propylbromide+alcoholic AgCN
ethyl bromide+alcoholic AgCN

Answer :A
Discussion
24.

In which of the following reactions ozone acts as a reducing agent?

Answer»

`BaO_(2) +O_(3) to BAO+2O_(2)`
`2HCl+O_(3) to Cl_(2) +H_(2)O+O_(2)`
`PbS+4O_(3) to PbSO_(4)+4O_(2)`
`2KI+O_(3)+H_(2)O to 2KOH +I_(2)+O_(2)`

Answer :A
Discussion
25.

In which of the following reaction(s) overset(12)CO_(2) is released ?

Answer»


`Ph-underset(Br)underset(|)CH-overset(Br)overset(|)CH-COOHunderset(Delta)overset(NaHoverset(14)CO_(3))to`
`Meoverset(14)COOHunderset(Delta)overset(NaHCO_(3))to`

SOLUTION : (B) `Ph-CH=CH-Br+CO_(2)+overset(14)CO_(2)`(C ) `Meoverset(14)COONa+CO_(2)`(d)
Discussion
26.

In which of the following reactions of alcohol there is no cleavage of C-O bond

Answer»

Oxidation REACTION of ALCOHOL
Dehydration reaction of alcohol
Reduction reaction of alcohol
Reaction of alcohol with phosphorous TRIBROMIDE

Solution :Oxidation of alcohol does not lead to the cleavage of C-O BOND of alcohol.
`R-CH_(2)-Ohoverset("pcc")to R-CHO`
Discussion
27.

In which of the following reactions of alcohol there is no cleavage of C-O bond ?

Answer»

OXIDATION REACTION of ALCOHOL
Dehydration reaction of alcohol
Reduction reaction of alcohol
Reaction of alcohol with PHOSPHOROUS tribromide

Solution :Oxidation reaction of alcohol
Discussion
28.

In which of the following reactions new carbon – carbon bond is not formed?

Answer»

ALDOL condensation
Friedel CRAFT reaction
Kolbe's reaction
Wolf kishner REDUCTION

Solution :Wolf kishner reduction
Discussion
29.

In which of the following complex, the metal ion In which of the following complex, the metal ion t_(2g)^(0),e_(g)^(0), configuration according to CFT

Answer»

`[FeF_(6)]^(3-)`
`FE(CN)_(6)]^(3-)`
`[Fe(CN)_(6)]^(2-)`
none

Solution :Strong FIELD ligands `(t_(2g)^(0),e_(g)^(2))`.
Discussion
30.

In which of the following complex ions, the magnitude of Delta_(@) (CFSE in octahedral field ) will be minimum ?

Answer»

`[CO(en)_3]^(3+)`
`[CoF_6]^(3-)`
`[Co(H_2O)_6]^(3+)`
`[Co(NH_3)_6]^(3+)`

Answer :B
Discussion
31.

In which of the following complex ion the value of magnetic moment (spin only) is sqrt(3)B.M. and oute rd-orbitals is used in hybridization:

Answer»

`[Fe(NH_(3))_(6)]^(3+)`
`[Mn(CN)_(6)]^(4-)`
`[CuCl_(5)]^(2-)`
`[Co(NH_(3))_(6)]^(2+)`

Solution :`[CuCl_(5)]^(2-),SP^(3)` d-hybridisation (OUTER orbital complex) (MAGNETIC MOMENT`=sqrt(3)` B.M.)
`[Fe(NH_(3))_(6)]^(3+),[Mn(CN)_(6)]^(4-) and [Co(NH_(3))_(6)]^(2+)` are inner orbital complexes and are ALSO paramagnetic in nature having magnetic moment of `sqrt(3)B.M.`
Discussion
32.

In which of the following complex ion, the central metal ion is in a state of sp^(3)d^(2) hybridisation ?

Answer»

`[CoF_(6)]^(3-)`
`[Co(NH_(3))_(6)]^(3+)`
`[FE(CN)_(6)]^(3-)`
`[Cr(NH_(3))_(6)]^(3+)`

Solution :Electronic configurations of :

`F^(-)`, being a weak LIGAND cannot cause forcible PAIRING of ELECTRONS within d subshell and forms outer orbital octahedral complex.
`[Co(NH_(3))_(6)]^(3+)` ion :

`NH_(3)` and `CN^(-)` are strong ligands, so they form inner orbital octahedral complex.
Discussion
33.

In which of the following reactions new carboncarbon bond is not formed?

Answer»

CANNIZZARO REACTION
Wurtz reactio
Aldol condensation
Friedel-Crafts reaction

Solution :In Cannizzaro reaction, an aldehyde devoid of any `alpha-H` atom disproportionates to an ACID and an ALCOHOL in a STRONGLY alkaline medium.
Discussion
34.

In which of the following reactions new carbon-carbon bond is not formed

Answer»

CANNIZZARO reaction
Wurtz reaction
Aldol condensation
Friedel-Crafts reaction

Solution :In Cannizzaro reaction, an ALDEHYDE devoid of any `alpha-H` ATOM disproportionates to an ACID and an alcohol in a strongly alkaline medium.
Discussion
35.

In which of the following reactions new carbon-carbon bond is not formed.

Answer»

Cannizzaro's reaction
Wurtz reaction
Aldol condensation
Friedal Craft's reaction.

Solution :`"CCl"_(3)CHO(2)," HCHO"(3)` and `C_(6)H_(5)CHO(5)` witl no `ALPHA`-hydrogen, do not undergo aldol condensation.
Discussion
36.

In which of the following reactions migration of alkyl group from carbon to oxygen is observed ?

Answer»

Pinacol-pinacolone rearrangement
Bayer-villiger oxidation.
Prepration of phenol from cumene hydroperoxide.
Both (B) & (C )

SOLUTION :N//A
Discussion
37.

In which of the following reactions, increase in the volume t constant temperaturee don't affect the number of moles at equlibrium

Answer»

`2NH_(3)hArrN_(2)+3H_(2)`
`C_((g))+1/2O_(2(g))hArrCO_((g))`
`H_(2(g))+O_(2(g))hArrH_(2)O_(2(g))`
None of these

Answer :D
Discussion
38.

In which of the following reactions K_p = K_c ?

Answer»

`N_2(G)+3H_2(g) HARR 2NH_3(g)`
`2NOCI hArr 2NO(g)+CL_2(g)`
`I_2(g)+H_2(g) hArr 2HI(g)`
`H_2(g)+CL_2(g) hArr 2HCL(g)`

ANSWER :D
Discussion
39.

In which of the following reactions, increase in the pressure at constant temperature does not affect the moles at equilibrium?

Answer»

`H_2(g)+ 1/2 O_2(g) ltimpliesH_2O(g)`
`H_2(g)+ I _2(g) LTIMPLIES 2HI(g)`
`C(g) +1/2 O ltimplies CO(g)`
`2NH_3(g) ltimplies N_2(g) + 3H_2(g)`

ANSWER :B
Discussion
40.

In which of the following reactions, increase in the pressure at constant temperature does not affect the moles at equilibrium.

Answer»

`2NH_(3)(G)hArrN_(2)(g) + 3H_(2)(g)`
`C(g)+1/2O_(2)(g)hArrCO(g)`
`H_(2)(g)+1/2O_(2)(g)hArrH_(2)O(g)`
`H_(2)(g)+I_(2)(g)hArr2HI`(g)

Answer :D
Discussion
41.

In which of the following reactions heterogenous catalysis is involved ? (i) 2SO_(2)(g)+O_(2)(g)overset(No(g))to 2SO_(3)(g) (ii) 2SO_(2)(g)overset(Pt(s))to2SO_(3)(g) (iii) N_(2)(g)+3H_(2)(g)overset(Fe(s))to2NH_(3)(g) (iv) CH_(3)COOCH_(3)(l)+H_(2)O(l)overset(HCl(l))toCH_(3)CJJOH(aq)+CH_(3)OH(aq)

Answer»

(II),(III)
`(ii),(iii),(IV)
(i),(ii),(iv)
(iv)

ANSWER :A
Discussion
42.

In which of the followingcombination of reagents precipitate is not formed.

Answer»

`Mn^(2+)(aq).+H_(2)O_(2)+NH_(3)" solution"`
`Al^(3+)(aq).+(NH_(4))_(2)S`
`Cr^(3+)(aq).+H_(2)O_(2)+NaOH" solution"`
`Fe^(2+)(aq).+Na_(2)O_(2)`

Solution :HBr In dark follows markovnikov's addition (ELECTROPHILIC addition) HBr in the presence of peroxide goes for anti-markovnikkov's product without any rearrangement.
HI follows markovnikov's addition in the presence or ABSENCE of peroxide.
Discussion
43.

In which of the following reactions HNO_3will not act as an oxidizing agent?

Answer»

`HNO_3 + H_2SO_4 to `
`HNO_3 + FeSO_4 + H_2SO_4 to `
`KL + HNO_3 to `
`AU + HNO_4 to `

SOLUTION :` HNO_3 + H_2SO_4toNO_2^(+) + HSO_4^(-) +H_2O`
In this reaction `HNO_3` is acting as `OH^-` donor and `H_2SO_4` as `H^+`donor. This is not a redox reaction.
Discussion
44.

In which of the following combination , beta-hydroxy carbonyl is obtained ?

Answer»

<P>(I)(i)(P)
(II)(ii)(S)
(III)(iii)(P)
(IV)(iv)(Q)

ANSWER :B
Discussion
45.

In which of the following reactions hydrogen gas is liberated ?

Answer»

`CH_(3) COOH + Na`
`CH_(3) COOH + NaHCO_(3)`
`CH_(3) COOH + NAOH`
`CH_(3) COOH + H_(2) O`

ANSWER :A
Discussion
46.

In which of the following combination hybridisation of central atom (**) does not change ?

Answer»

`H_(2)O+ overset(**)CO_(2)`
`H_(3)overset(**)BO_(3)+OH^(-)`
`BF_(3)+overset(**)NH_(3)`
NONE of these

Answer :C
Discussion
47.

In which of the following reactions heterogeneous catalysis is involved?(i) 2SO_(2)(g)+O_(2)(g) overset(NO(g))(to) 2SO_(3)(g) (ii) 2SO_(2)(g) overset(Pt(s))(to) 2SO_(3)(g) (iii) N_(2)(g)+3H_(2)(g) overset(Fe(s))(to) 2NH_(3)(g) (iv) CH_(3)COOCH_(3)(l)+H_(2)O(l) overset(HCl(l))(to)CH_(3)COOH(aq)+CH_(3)OH(aq)

Answer»

(II), (III)
(II), (III), (IV)
(I), (II), (III)
(IV)

ANSWER :A
Discussion
48.

In which of the following Cl- is not easily replaced?

Answer»

`CH_(3)CH_(2)Cl`
Picryl CHLORIDE
Vinyl chloride
Allyl chloride

Solution :Because `Cl^(-)` is INVOLVED in resonance with `pi-` electrons of double BOND.
Discussion
49.

In which of the following reactions heterogeneous catalysis is involved ? (i)2SO_(2(g))+O_(2(g))overset(NO_((g)))rarr 2SO_(3(g)) (ii) 2SO_(2(g))overset(Pt_(s))rarr 2SO_(3(g)) (iii) N_(2(g))+3H_(2(g))overset(Fe_(s))rarr 2NH_(3(g)) (iv) CH_(3)COOCH_(3(l))+H_(2)O_((l))overset(HCl_((l)))rarr CH_(3)COOH_((aq))+CH_(3)OH_((aq))

Answer»

(ii), (iii) 
(ii), (iii) and (iv) 
(i), (ii) and (iii) 
(iv) 

SOLUTION :The catalysts and the REACTANTS are in DIFFERENT PHASE.
Discussion
50.

In which of the followingCI is not easily replaced

Answer»



`CH_(2)=CHCH_(2)CI`
`CH_(3)CH_(2)CI`

Answer :B
Discussion