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 heterogeneous catalysis is involved? (i) 2SO_2(g) + O_2(g) overset(NO(g))to 2SO_3(g) (ii) 2SO_2 (g) + O_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_3COOCH_3(l) + H_2O(g) overset(HCl(l))to CH_3COOH(aq) + CH_3OH (aq) options-a). (i), (iii) b) (ii), (iii), (iv)c)(i), (ii), (iii)d)(iv)

Answer»

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

ANSWER :B
Discussion
2.

In which of the following chlorine is least reactive

Answer»

ETHYL CHLORIDE
Chlorobenzene
Allyl chloride
Methyl chloride

ANSWER :B
Discussion
3.

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) + O_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_3COOCH_3(l) + H_2O(g) overset(HCl(l))to CH_3COOH(aq) + CH_3OH (aq)

Answer»

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

ANSWER :A
Discussion
4.

In which of the following, cationic is present-

Answer»

`IF_(7)`
`ICI_(3)`
`IPO_(4)`
`I_(2)O_(5)`

ANSWER :B
Discussion
5.

in which of the following reactions, H_2O_2 is acting as a reducing agent?

Answer»

`PBS + 4H_2O_2rarr PbSO_4+ 4H_2O`
`Cl_2 + H_2O, rarr2HCI + O_2`
`2Fe^2 +H_2O_2rarr2Fe^(3+) + 2OH`
`H_2SO_4 + H_2O_2 RARR H_2SO_4 + H_2O`

ANSWER :B
Discussion
6.

In which of the following changes,Delta H is always negative :

Answer»

enthalpy of SOLUTION
enthalpy of hydrogenation
enthalpy of REACTION
enthalpy of transition

Solution :`DeltaH`is NEGATIVE when ENERGY RELEASES. During hydrogenation energy releases.
Discussion
7.

In Which of the following reactions H_(2)O_(2) acts as a reducing agent

Answer»

`PbO_(2)(s) +H_(2)O_(2)(AQ) to PbO (s) +H_(2)O(l) +O_(2)(g) `
`Na_(2)SO_(3)(aq) +H_(2)O_(2)(aq) to Na_(2)SO_(4) (aq) +H_(2)O(l)`
`2KL(aq)+H_(2)O_(2) (aq) to 2KOH (aq) +I_(2)(s)`
`KNO_(2)(aq)+H_(2)O_(2)(aq) to KNO_(3) (aq) +H_(2)O(l)`

Solution :In the following reaction `H_(2)O_(2)` ACTS as a reducing agent.
`PbO_(2(s)) +H_(2)O_(2(aq)) to PbO_((s)) +H_(2)O_((l))+O_(2(g))`
Discussion
8.

In which of the following cases will a violet colouration be observed?

Answer»

An alkaline solution of sodiumnitroprusside is treated with a solution of `Na_(2)S`
a solution of sodiumnitroprusside in aq.NaOH is treated with `Na_(2)SO_(3)`
a solution of cobalt NITRITE treated with KCI.
a solution of `Mn(NO_(3))_(2)` is treated with sodium bismuthate (or) red LEAD in presence of conc. `HNO_(3)`

Solution :`Mn(HO_(3))_(2)+6HNO_(3)+5NaBiO_(3) to Na_(4)[FE(CN)_(5)NOS]` (violet colour)
Discussion
9.

In which of the following cases, the reaction is spontaneous at all temperatures ?

Answer»

`Delta H gt 0, DeltaG gt 0`
`Delta H LT 0, DeltaG gt 0`
`Delta H lt 0, DeltaG lt 0`
`Delta H gt 0, DeltaG lt 0`

ANSWER :B
Discussion
10.

In which of the following reactions, H_(2)O_(2) acts as a reducing agent?

Answer»

`HOCl + H_(2)O_(2) OVERSET(H^(+)) to H_(3)O^(+) + Cl^(-) + O_(2)`
`Mn^(2+) + H_(2)O_(2) overset(OH^(+)) to Mn^(4+) + 2OH^(-)`
`2Fe^(2+) + H_(2)O_(2) overset(OH^(-)) to 2Fe^(3+) + 2OH^(-)`
`PbS(s) + 4H_(2)O_(2)(aq) overset(H^(+)) to PbSO_(4)(s) + 4H_(2)O` (l)

SOLUTION :In the reaction,

OXIDATION number of oxygen increases from `-1` to 0. Hence, `H_(2)O_(2)` acts are reducing agent.
Decreases in `ON^(-)` (reduction)
Discussion
11.

In which of the following cases, the strength of back bonding is maximum

Answer»

`: C Cl_(2)`
`: CF_(2)`
`PF_(3)`
`(CH_(3))_(2)PO`

ANSWER :A
Discussion
12.

In which of the following reactions does NH_(3) act as a acid?

Answer»

`NH_(3)+H^(+)rarrNH_(4)`
`NH_(3)+H^(+)rarrNH_(2)^(-)+H_(2)`
`NH_(3)+HClrarrNH_(4)CL`
None as `NH_(3)` is a base

Solution :In the REACTION ,`NH_(3)` CHANGES to `NH_(2)^(-)` so `NH_(3)` has donated a proton `(H^(+))` and hence ACTS as an acid.
Discussion
13.

In which of the following cases, the element is oxidised into its highest oxidation state when it reacted with ozone under moist condition.

Answer»

S
`I_(2)`
P
As

Answer :A::C::D
Discussion
14.

In which of the following reactions does the heat change represent the heat of formation of water

Answer»

`2H_(2)(g)+O_(2)(g)rarr2H_(2)O(l),DeltaH=-116 kcal`
`H_(2)(g)+(1)/(2)O_(2)(g)rarrH_(2)O(l),DeltaH=-58 kcal`
`H^(+)(aq.)+OH^(-)(aq.)rarr2H_(2)O(l), DeltaH=-13.7 kcal`
`C_(2)H_(2)(g)+2(1)/(2)O_(2)(g)rarr2CO_(2)(g)+H_(2)O(l), DeltaH=-310 kcal`

Solution :HEAT of formation is the formation of one MOLE of the substance from its elements.
Discussion
15.

In which of the following cases, the complex ion formed will migrate towards the anode under the electric field?

Answer»

Excess of aqueous KCN ADDED to `CdSO_(4)`
Aqueous solution of `CuSO_(4)` CONTAINING excess of `NH_(3)`
AgBr added ty hypo solution in excess
A solution of `AgNO_(3)` in aqueous KCN

Solution :a. `CdSO_(4)+4KCNtoK_(2)[Cd(CN)_(4)]+K_(2)SO_(4),"Complex ion" : `[Cd(CN)_(4)]^(2-)`
b. `CuSo_(4)+4NH_(3)to[Cu(NH_(3))_(4)[SO_(4)`, "Complex ion": [Cu(NH_(3))_(4)]^(2+)`
c. `AgBr+2Na_(2)S_(2)O_(3)toNa_(3)[Ag(S_(2)O_(3))_(2)]+NaBr, "Complex ion" : [Ag(S_(2)O_(3))_(2)]^(3-)`
d.`AgNO_(3)+2KCNtoK[Ag(CN)_(2)]+KNO_(3),"Complex ion": [AgCN)_(2)]^(-)`
Discussion
16.

In which of the following reactions give only primary amine

Answer»

`RCN overset(H_(2)-NI)to`
`RCONH_(2) overset(LiAlH_(4))to`
`RCH_(2)NO_(2)overset(Sn//HCl)to`
All the above

Solution :All REACTIONS give only `1^(@)` amine
Discussion
17.

In which of the following cases the covalent character and the mpt order are same :-

Answer»

`BeCl_(2), CaCl_(2), BaCl_(2)`
`NaCl, MgCl_(2), AlCl_(3)`
`BeO, MGO, CaO`
`NAF, MgF_(2), AlF_(3)`

Solution :`underset({:("SIZE of cation"(DARR)),("covalent character"(uarr)),(L.E.(uarr)M.P.(uarr)):})overset("NaF MgF"_(2)" AlF"_(3))to`
Discussion
18.

In which of the following reactions does the amine behaves as an acid ?

Answer»

`(C_(2)H_(5))_(2)NH+H_(2)PtCl_(6)`
`CH_(3)NH_(2)+H_(2)O`
`(Me_(2)CH)_(2)NH+n-C_(4)H_(9)Li`
`(C_(2)H_(5))_(3)N+BF_(3)`

SOLUTION :`(Me_(2)CH)_(2)` (acid)-`NH+n` (base) `C_(4)H_(9)Li`
Discussion
19.

In which of the following cases, rate of disappearance of any reactant at a given instant equals to rate of appearance of any product

Answer»

`H_(2)+F_(2) to 2HF`
`N_(2)+3H_(2) to 2NH_(3)`
`PCl_(5) to PCl_(3)+Cl_(2)`
`H_(2)+(1)/(2)O_(2) to H_(2)O`

ANSWER :C
Discussion
20.

In which of the following cases, Na is not obtained at the cathode during electrolysis, fused NaCl, fused NaOH, aq. NaOH and why ?

Answer»


ANSWER :
Discussion
21.

In which of the following reactions correct major product is mentioned ?

Answer»




SOLUTION :All OPTIONS are CORRECT
Discussion
22.

In which of the following cases metal obtained by carbon reduction is in liquid state?

Answer»




NONE of these

Solution :When state of reduced metal CHANGES from solid to liquid and then GAS, there is steep INCREASE in value of `DeltaG^(@)`. In case of (1), (2) metal obtained is in GASEOUS state in case of (3) it is in liquid state.
Discussion
23.

In which of the following reaction(s) correct major product is given

Answer»




ANSWER :A::B::D
Discussion
24.

In which of the following reactions cone. H_2SO_4 is used as an oxidising reagent ?

Answer»

`CaF_(2) + H_(2)SO_(4) to CaSO_(4) + 2HF`
`2HI + H_(2)SO_(4) to I_(2) + SO_(2) + 2H_(2)O`
`Cu + 2H_(2)SO_(4) to CuSO_(4) + SO_(2) + 2H_(2)O`
`NaCl + H_(2)SO_(4) to NaHSO_(4) + HCl`

SOLUTION :Cu is first oxidised to OXIDE and then oxide combines with an acid to give copper sulphate.
`H_(2)SO_(4) to H_(2)O + SO_(2) + [O]`
`Cu + [O] to CuO`
`CuO + H_(2)SO_(4) to CuSO_(4) + H_(2)O`
Discussion
25.

In which of the following cases is the reaction spontaneous at all temperatures?

Answer»

`DELTAH GT 0, DELTAS gt 0`
`DeltaH lt 0, DeltaS lt 0`
`DeltaH lt 0, DeltaS lt 0`
`DeltaH lt 0, DeltaS=0`

Answer :B::D
Discussion
26.

In which of the following reactions, conc. H_(2)SO_(4) is used as an oxidising reagent ?

Answer»

`CaF_(2) + H_(2)SO_(4) rarr CaSO_(4) + 2HF`
`2 HI + H_(2)SO_(4) rarr I_(2) SO_(2) + 2H_(2)O`
`Cu + 2H_(2)SO_(4) rarr CuSO_(4) + SO_(2) + 2H_(2)O`
`NaCl + H_(2)SO_(4) rarr NaHSO_(4) + HCL`

Solution :`2overset(-1)(HI)+H_(2)overset(+6)(SO)_(2) rarr overset(0)(I_(2))+overset(+4)(SO)_(2)+H_(2)O","overset(0)(Cu) + 2H_(2)overset(+6)(SO)_(4) rarr CuSO_(4)+ overset(+4)(SO)_(2)+2H_(2)O`
In these two REACTIONS, `H_(2)SO_(4)` acts as an oxidising agent.
Discussion
27.

In which of the following cases, does the reaction go farthest to completion :

Answer»

K = `10^3`
K = `10^(-2)`
K = 10
K = 1

Answer :A
Discussion
28.

In which case (E_("cell")-E_("cell")^(@)) is zero

Answer»

`CU|Cu^(2+)(0.01 M)||Ag^(+)(0.1 M)|Ag`
`Pt(H_(2))|pH=1||Zn^(2+)(0.01 M)|Zn`
`Pt(H_(2))|pH=1||Zn^(2+)(1 M)|Zn`
`Pt(H_(2))|H^(+)=0.01 M)||Zn^(2+)(0.01 M)|Zn`

Solution :(a,b) are correct.
(a) `E_(cell)=E_(cell)^(@)-(2.303" RT")/(2F)"log"([Cu^(2+)])/([Ag^(+)]^(2))`
`E_(cell)-E_(cell)^(@)=(2.303" RT")/(2F)"log"(0.01)/((0.1)^(2))`
`E_(cell)-E_(cell)^(@)=0`
(b) `E_(cell)-E_(cell)^(@)=-(2.303" RT")/(2F)"log"([H^(+)]^(2))/([Zn^(2+)])`
`E_(cell)-E_(cell)^(@)=-(2.303" RT")/(2F)"log"((1xx10^(-1))^(2))/((0.01))=0`
(C ) `E_(cell)-E_(cell)^(@)=-(2.303" RT")/(2F)"log"([H^(+)]^(2))/([Zn^(2+)])`
`=-(2.3030" RT")/(2F)"log"((1xx10^(-1))^(2))/(1)ne 0`
(d) `E_(cell)-E_(cell)^(@)=-(2.303" RT")/(2F)"log"([H^(+)]^(2))/([Zn^(2+)])`
`=-(2.303" RT")/(2F)"log"((0.1)^(2))/((0.01))ne0`
Discussion
29.

In which of the following reactions, chlorine acts as an oxidizing agent ? I : CH_(3)CH_(2)OH + Cl_(2) to CH_(3)CHO + 2HCl II: CH_(3)CHO+ Cl_(2) to C CI_(3)CHO + HCI III : CH_(3) +Cl_(2) overset(hv)to CH_(3)Cl + HCI The correct answer is :

Answer»

only I
only II
Iand II
I,II and III

Answer :D
Discussion
30.

In which of the following reactions benzaldehyde is the final major products (i) Ph-CH_(3)+CrO_(3)+(CH_(3)CO)_(2) O overset(273-283K)to overset(H_(3)O^(+))underset(Delta)to (ii) Ph-CH_(3)-overset(Cl_2)underset(hv)to Ph-CHCl_(2) overset(H_(2)O)underset(100^(@)C)to (iii) C_(6)H_(6) overset(CO+HCl)underset(AlCl_(3))to (iv) Ph-COCl+(CH_(3))_(2)Cd to

Answer»

I and ii only
ii and iii only
iii and iv only
I,ii and iii only

Solution :(i) `Ph-CH_(3)+CrO_(3)+(CH_(3)CO)_(2)O OVERSET(273-283K)toPh-CH(OCOCH_(3))_(2) overset(H_(3)O^(+))underset(DELTA)toPh-CHO`
(ii) `Ph-CH_(3) overset(Cl_(2))underset(HV)toPh-CHCl_(2) overset(H_(2)O)underset(100^(@)C)toPh-CHO`
`(iii) C_(6)H_(6) overset(CO+HCl)underset(AlCl_(3))toPH-CHO`
`(iv) Ph-COCl+(CH_(3))_(2)CD to Ph-CO-CH_(3)`
Discussion
31.

In which of the following cases C-C bond length will be highest? (I) In N_(2)F_(4), d-orbitalsare contracted by electronegative flourine atoms, but d-orbitals contraction is not possible by H-atoms in N_(2)H_(4) (II) The N-N bond energy in N_(2)F_(4) is more than N-N bond energy in N_(2)H_(4) (III) The N-N bond lengthin N_(2)F_(4) is more than that of in N_(2)F_(4) (IV) The N-N bond length in N_(2)F_(4) is less than that of in N_(2)H_(4) choose the correct codes:

Answer»

I, II and III
I and III
II and IV
II and III

Solution :
It can be explained on the basis of Bent's Rule . In `N_(2)F_(4)`, N-N bond has more s-character hence bond length decrease.
While in `N_(2)H_(4), N-N` bond has less s-character (i.e., more p-character), hence bond LENGTHS.
Discussion
32.

In whichof the following reactions carbon-carbon bond formation takes place ?

Answer»

Cannizaro
Reimer -Tiemann
HVZ REACTION
SCHMIDT reaction

ANSWER :B
Discussion
33.

In which of the following cases, DeltaGlt 0 at all temperatures ?

Answer»

`DeltaH=0, DELTAS=0`
`DeltaH GT 0, DeltaS LT 0`
`DeltaH lt 0, DeltaS gt 0`
`DeltaH lt 0, DeltaS lt 0`

Answer :A::C::D
Discussion
34.

In which of the following cases C-C bond length will be highest?

Answer»

`CH_(3)-CF_(3)`
`FCH_(2)-CH_(2)F`
`F_(2)CH-CHF_(2)`
`CF_(3)-CF_(3)`

SOLUTION :According to Bent.s Rulemore electronegative substituents attached to HYBRID orbital that contains more p-character. HENCE , more p-character, longer will be bond length.
Discussion
35.

In which of the following reactions both the oxidised and reduced forms of the same compound are obtained ?

Answer»

ROSENMUND reduction
Aldol condensation
Cannizzaro REACTION
Haloform reaction

Solution :cannizzaro.s reaction
Discussion
36.

In which of the following cases entropy decreases?

Answer»

SOLID CHANGING to liquid
Expansion of a gas
Crystals dissolve
Polymerisation

Answer :D
Discussion
37.

In which of the following reactions an otically active single product is formed ?

Answer»




SOLUTION :N//A
Discussion
38.

In which of the following case, the forms of amino acid and pH is (are) correctly matched ?

Answer»

`{:("ALANINE :pH=3 , "H_(3) overset(+)(N)-C-COO^(-)),("|"),(""CH_(3)):}`
`{:("Leucine :pH=10 , "H_(2)N-"CH"-COO^(-)),("|"),(""CH_(2)-"C H"-CH_(3)),("|"),(""CH_(3)):}`
`{:("Asparic ACID :pH=9 , "H_(2)N-"CH"-COO^(-)),("|"),(""CH_(2)-COO^(-)):}`
`{:("LYSINE :pH=3 , "H_(3)overset(+)(N)-CH-COOH),("|"),(""CH_(2)CH_(2)CH_(2)CH_(2) overset(+)(N)H_(3)):}`

Answer :B::C::D
Discussion
39.

In which of the following reactions after 100% completion, the colligative property of the final solution is increased by "greater than 40% " than that of initial solution ? (Note : All salts alpha=1 except Hg (CN)_(2). Precipitates removed,Ignore trace ions, Ignorevolume changes, No limiting reagent )

Answer»

`underset ((aq))(AgNO_(3))+underset(("added"))(NACL)rarr AgCl darr+underset((aq))(NaNO_(3))`
`BaCl_(2)+underset(("added"))(Na_(2)SO_(4))rarrBaSO_(4)1darr+underset(("aq"))(2NaNO_(3))`
`Hgunderset(("aq"))((NO_(3))_(2))underset(("added"))(2KCN)rarrHgunderset((alpha=q))underset(("aq"))((CN)_(2))+2underset(("aq"))(KNO_(3))`
`2underset(("aq"))(Na_(3)PO_(4))+underset(("added"))(3BaCl_(2))rarrBa_(3)(PO_(4))_(2)darr+NaCl`

Answer :C::D
Discussion
40.

In which of the following cases a gas is more compressible than the ideal gas?

Answer»

`pbarVgtRT`
`pbarV=RT`
`pbarVltRT`
none

Answer :C
Discussion
41.

In which of the following reactions, addition does not occur according to Markovnikov's rule?

Answer»

`CH_3 CH = CH_2 + HCl overset(ROOR) (to)`
`CH_3 CH = CH_2 + HBr overset(ROOR)(to)`
`CH_(2) = CH_(2) + HI overset (ROOR)(to)`
`CH_(3) CH= CHCH_(3) + HBr overset(ROOR)(to)`

Solution :In PRESENCE of PEROXIDES , only the addition of HBr to unsymmetrical alkenes does occur according to Markovnikov.s RULE . SINCE alkene (b) is unsymmetrical while alkene (d) is symmetrical , therefore , the correct answer is (b) .
Discussion
42.

In which of the following case, equlibrium constant decreases with increase of temperture

Answer»

When the reaction is EXOTHERMIC
When the reaction is endothermic
When the reaction is in the GASEOUS phase
When the reaction TAKES place in the solution

Solution :`K=(k_(F))/(k_(B)).` In exothermic reactions, `K_(b)` increases more. Hene, K decreases.
Discussion
43.

In which of the following reactions a brown coloured gas is evolved ?

Answer»

`KBr (s) + " dil." H_(2)SO_(4) to`
`NH_(4)NO_(2) overset(Delta)to`
`NaNO_(3) UNDERSET(800^(@)C) overset(Delta)to`
`AgNO_(3)(s)+conc. H_(2)SO_(4) to`

Answer :D
Discussion
44.

In which of the following case entropy decreases:

Answer»

SOLID CHANGING to liquid
Expansion of a gas
Crystals dissolve
Polymerisation

Answer :D
Discussion
45.

In which of the following reactions 1-bromopentane is converted into l-aminopentane only

Answer»

Treatment with AMMONIA followed by NaOH
Treatment with potassium phthalimide followed by HYDROLYSIS
Reaction with KCN followed by REDUCTION with `LiAI/H_(4)`
Reaction with acetylchloride followed by reduction with `LiAI/H_(4)`

Solution :
Discussion
46.

In which of the following case, does the reaction go farthest to completion ?

Answer»

`K = 10^(10)`
`K=10^(-20)`
K = 10
K = 1

SOLUTION :Larger the value of K, FARTHER the REACTION go to COMPLETION.
Discussion
47.

In which of the following reaction, the formation of product is favoured by increase in pressure?

Answer»

`CO_2(g)ltimplies 2CO(g)+O_2(g)`
`3O_2(g) ltimplies2O_3(g)`
`CO_2(g)+C(s)ltimplies 2CO(g)`
`CH_4(g)+H_2O(g)ltimplies CO(g)+3H_2(g)`

ANSWER :B
Discussion
48.

In which of the following carbonyls, the bond length of CO is the highest ?

Answer»

`[V(CO)_6]^-`
`[CR(CO)_6]`
`[MN(CO)_6]^+`
`[Fe(CO)_4]^(2-)`

Answer :D
Discussion
49.

In which of the following reaction t-butylbenzene is formed:

Answer»

Benzene + iso-butyl chloride, `AlCl_(3)`
Benzene `+(CH_(3))_(2)C=CH_(2) OVERSET(BF_(3)HF)(RARR)`
Benzene + t-butyl alcohol `overset(H_(2)SO_(4))(rarr)`
Benzene `+(CH_(3))_(2)C=CH_(2) overset(H^(o+))(rarr)`

Answer :A::B::C::D
Discussion
50.

In which of the following carbon has maximum electronegativity?

Answer»

`C_(2)H_(4)`
`C_(2)H_(6)`
`C_(2)H_(2)`
same in all

Solution :As the s-character in hybridisation INCREASES, the electronegativity increases.
Discussion