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 the following salts the highest value of magnetic moment is observed in

Answer»

`MnSO_(4).4H_(2)O`
`CuSO_(4).5H_(2)O`
`FeSO_(4).6H_(2)O`
`ZnSO_(4).7H_(2)O`

SOLUTION :`Mn^(2+)=3d^(5)` i.e.No. of unpaired `e^(-)=5`
`Cu^(2+)=3d^(9)` i.e. no of unpaired `e^(-)=1`
`Fe^(2+)=3d^(6)` i.e. no of unpaired `e^(-)=4`
`Zn^(2+)=3d^(10)` i.e. no of unpaired `e^(-)=0`
`Ni^(2+)=3d^(8)` i.e., no. of unpaired `e^(-)=3`
HIgher the number of unpaired electrons higher will be the magnetic moment. hence `Mn^(2+)` having maximum unpaired electrons will have the maximum magnetic moment.
Discussion
2.

In the conversion of Br_(2) to BrO_(3)^(-) , the oxidation number of Br changes from

Answer»

zero to + 5
`+1` to `+5`
zero to `-3`
`+2` to `+5`

Solution :`Br_(2)to BrO_(3)^(-)`
Any FREE (unattached) element with no CHARGE has the oxidation STATE of zero.
Let the oxidation number of Br in `BrO_(3)^(-)` be x.
Hence `x+3xx (-2)=-1`or,`x-6=-1`
or,`x=+5`.
Discussion
3.

In the conversion of (A) to (B), the best method for the protection of (OH) group is silylation method because:

Answer»

Benzylation method is not effective as `Ag_(2)O` MIGHT react with Br group of the reactant to give an (OH) group.
ROTHP cannot be used because the alcohol is likely to rearrange under the ACIDC CONDITIONS of ether formation.
Silylation method is effective since (OH) group is not sterically hindered.
The reaction can be without protecting (OH) group, as shown below:
`(A)overset(1. Mg//ether)underset(2.D_(2)O)rarr(B)`

Solution :NA
Discussion
4.

In the conversion of (A) HOCH_(2)C-=CH to (B) HOCH_(2)C-=C-Me, the best method is:

Answer»

`(A)OVERSET(1.NaNH_(2))underset(2.Mel)rarr(B)`


Solution :NA
Discussion
5.

In the following reacton, product P is R-overset(O)overset(||)C-Cloverset(H_(2))underset(Pd-BaSO_(4))rarrP

Answer»

RCHO
`RCH_(3)`
RCOOH
`RCH_(2)OH`

Answer :A
Discussion
6.

In the conversion of (A) to (B), the best method for the protection of (OH) group is:

Answer»

Benzylation method
Silylation method
ROTHP method
Both (a) and (B)

SOLUTION :NA
Discussion
7.

In the following reactions, ZnO is respectively acting as/an…. (i) ZnO + Na_(2)O rarr Na_(2)ZnO_(2) (ii) ZnO + CO_(2) rarr ZnCO_(3)

Answer»

ACID and acid
acid and base
base and acid
base and base

Solution :ZNO is an AMPHOTERIC OXIDE
Discussion
8.

In the following reactions, the final product B is …..CH_(3)Cl overset(KCN)rarr A overset(H^(+)//H_(2)O)rarr B

Answer»

`CH_(3)COOH`
H COOH
`CH_(3)NH_(2)`
`CH_(3)COCH_(3)`

SOLUTION :`CH_(3)Cl overset(KCN)underset(-KCl)rarr underset((A))(CH_(3)CN)overset(H^(+)//H_(2)O)rarr underset((B))(CH_(3)COOH)`
Discussion
9.

In the following reactions, the product S is

Answer»




ANSWER :A
Discussion
10.

In the context of the Hall - Heroult process for the extraction of Al, which of the following statement is false ?

Answer»

CO and `CO_2` are produced in this process
`Al_2O_3` is MIXED with `CaF_2` which lowers the melting point of the mixture and brings conductivity
`Al^(3+)` is reduced at the cathode to form Al
Na3AlF6 serves as the electrolyte

Solution :SILVER is EXTRACTED form argentite ore by the process of leaching . In the first step, argentite ore reacts with KCN or NaCN to form a co - ordination compound . In the second step , the co - ordination compound reacts with zinc, to produce silver metal.
`Ag_2S+KCN+underset("Oxidant")(O_2)rarrK[Ag(CN)_2]+K_2S_2O_3`
`2K[Ag(CN)_2]+underset("Reluctant")(Zn)rarrK_2[Zn(CN)_4)+2Agdarr`
Thus, `O_2` and Zn are oxidant (oxidising AGENT) and reluctant (reducing agent ) respectively.
Discussion
11.

In the following reactions sequences, The compounds (X) and (Y) are resepctively are:

Answer»




ANSWER :B
Discussion
12.

In the followingreactions sequence . the correctstructures of A,B and C are

Answer»




SOLUTION :
Discussion
13.

In the following reactions prouct X and Y are

Answer»


ANSWER :`(##RES_CHM_CCAK_E01_020_A01##)`
Discussion
14.

In the following reactions, reactants A, B and C are: C_2H_5NH_2 + A to C_2H_5N = CN - C_6H_5 + H_2O "Urea" + B to H_2N - NHCONH_2 + NH_3 C_2H_5 NH_2 + C to C_2H_5Cl+H_2O+N_2

Answer»

`CH_3CHO,NH_2 - NH_2 and PCl_5`
`C_6H_5CHO,NH_2-NH_2and SOCl_2`
`C_6H_5CHO,NH_2-NH_2and NOCL`
`CH_3CHO,NH_2-NH_2 and PCl_3`

ANSWER :C
Discussion
15.

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false ?

Answer»

CO and `CO_2` are PRODUCED in this process
`Al_2O_3` is mixed with `CaF_2`which lowers the melting POINT of the mixture and brings conductivity
`AL^(3+)`is reduced at the cathode to form Al
`Na_3AlF_6`serves as the electrolyte

Answer :D
Discussion
16.

In the following reactions: PCl_(5)+SO_(2)toP+Q P+CH_(3)-underset(O)underset(||)C-OHtoR+SO_(2)+HCl R+(CH_(3))_(2)CdtoS+CdCl_(2) choose the correct options

Answer»

Product S is acetone
P is `POCl_(3)`
P is `SOCl_(2)`
`R` is `CH_(3)-underset(O)underset(||)C-Cl`

Solution :`P=SOCL-(2).Q=POCl_(3),R=CH_(3)-underset(O)underset(||)C-Cl`
`S=` acetone
Discussion
17.

In thecontext ofthe Hall - Heroultprocess fortheextraction ofAl, which ofthefollowingstatementsis false ?

Answer»

` Al^(3+) `is reducedatthecathodeto form Al
` Na_3 AlF_6 `servesastheelectrolyte
` CO and CO_ 2 `areproducedinthisprocess
` Al_ 2 O_3`ismixedwith `Ca F_ 2 `which lowers themelting pointofthe mixtureandbringsconductivity

SOLUTION :` NA _3 AlF_ 6`DOESNOT serveaselectrolyte. Insteadmoltenaluminaservesastheelectrolyte.
Discussion
18.

In the following reactions . ltb rgt CH_3-overset(CH_3)overset(|)CH-underset(OH)underset(|)CH-CH_3overset(H^+//heat)rarrunderset([underset("product")"Major"])A+underset([underset("product")("Minor")])B (ii) Aoverset("HBr, dark")underset("in absence of peroxide")rarrunderset([underset("product")"Mejor"])C+underset([underset("product")("Minor")])D The major products A and C are repectively

Answer»

`CH_2=OVERSET(CH_3)overset(|)C-CH_2-CH_3" and" UNDERSET(BR)underset(|)CH_2-overset(CH_3)overset(|)CH-CH_2-CH_3`
`CH_3-overset(CH_3)overset(|)C=CH-CH_3 " and "CH_3-overset(CH_3)overset(|)underset(Br)underset(|)C-CH_2-CH_3`
`CH_3-overset(CH_3)overset(|)C=CH-CH_3 " and "CH_3-overset(CH_3)overset(|)CH-underset(Br)underset(|)CH-CH_3`
`CH_3-overset(CH_3)overset(|)C=CH-CH_3 " and "CH_3-underset(Br)underset(|)overset(CH_3)overset(|)C-CH_2-CH_3`

SOLUTION :
Discussion
19.

In the followingreactions, identify the compounds/reaction conditions represented by the alphabets A and B. PbS underset("air")overset("Heat in")rarr A+PbS overset(B)rarr Pb+SO_(2)

Answer»
Discussion
20.

In the contact process, vanadium pentoxide is considered a better catalyst than platinised asbestos. Why?

Answer»

Solution :VANADIUM pentoxide is CONSIDERED a better CATALYST than platinised asbestos because it is cheap and not easily POISONED by the impurities PRESENT in the gases.
Discussion
21.

In the contact process, the impurities osasrsenic are removed by

Answer»

`Fe_2O_3`
`Fe(OH)_3`
`Al(OH)_3`
`Cr(OH)_3`

SOLUTION :In the contact process the arsenic impurities are removed by `Fe(OH)_3`(GELATINOUS) which ABSORBS ARSENIOUS oxide
Discussion
22.

Why vanadium pentoxide is considered as a better catalyst than platinised asbestos ?

Answer»

Solution :Vanadium PENTOXIDE is CONSIDERED a BETTER catalyst than platinised asbestos because it is cheap and not easily POISONED by the impurities PRESENT in the gases.
Discussion
23.

In the contact process of manufacturing of H_2SO_4 the catalyst used in

Answer»

`P_2O_5`
`V_2O_5`
`N_2O_5`
`N_2O_4`

ANSWER :B
Discussion
24.

In the contact process of H_2SO_4, SO_3 dissolves in sulphuric acid to give:

Answer»

Permonosulphuric acid
Thiosulphuric acid
Pyrosulphuric acid
Perdisulphuric acid

Answer :C
Discussion
25.

In the following reactions, (i) CH_(3)-overset(CH_(3))overset(|)(C)H-underset(OH)underset(|)(C)H-CH_(3) overset(H^(+)//Heat)to underset(("Major products"))(A)+underset(("Minor products"))(B) (ii) A underset("in absence of peroxide")overset(HBr,dark)to underset(("Major products"))(C)+underset(("Minor products"))(D) The major products (A) and (C) are respectively

Answer»

`CH_(3)=OVERSET(CH_(3))overset(|)(C)-CH_(2)-CH_(3) and CH_(3)-UNDERSET(Br)underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-CH_(3)`
`CH_(2)=overset(CH_(3))overset(|)(C)-CH_(2)-CH_(3) and underset(Br)underset(|)(C)H-overset(CH_(3))overset(|)(C)H-CH_(2)-CH_(3)`
`CH_(3)-overset(CH_(3))overset(|)(C)=CH-CH_(3) and CH_(3)-underset(Br)underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-CH_(3)`
`CH_(3)-overset(CH_(3))overset(|)(C)=CH-CH_(3) and CH_(3)-overset(CH_(3))overset(|)(C)H-underset(Br)underset(|)(C)H-CH_(3)`

Solution :

(c) is CORRECT
Discussion
26.

In the concentration cells the electrical energy is produced due to :

Answer»

OXIDATION of fuel
Heat energy
Chemical reaction
Transfer of a SUBSTANCE from ONE CONCENTRATION to other

Answer :D
Discussion
27.

In the following reactions, identify the compounds (A), (B), (C) and R-MgBr.

Answer»

Solution :(A) `HCOOCH(CH_(3))_(2)`, (B) `(CH_(3))_(2)CHOH`, (C) HCOOH, R-MgBr is `CH_(3)MgBr`
Discussion
28.

In which cell, electrical energy is converted into chemical energy:

Answer»

OXIDATION of fuel
Heat energy
Chemical reaction
Transfer of a SUBSTANCE from ONE CONCENTRATION to other

Answer :D
Discussion
29.

In the following reactions Answer the following questions: The major compound (Y) is:

Answer»




SOLUTION :
Discussion
30.

In the compound M-O-H, the M-O bond will be broken if:

Answer»

`Delta(EgtN.)` of M and O `lt Delta` (E.N.) of O and H
`Delta` (E.N.) of M and O=`Delta` (E.N.) of O and H
`Delta` (E.N.) of M and `O GT Delta` (E.N.) of O and H
Cannot be predicted according `Delta(E.N.)` data

Answer :C
Discussion
31.

In the following reaction: ZnS+O_(2)overset(Delta)rarrA+ZnO 4HCl+O_(2)overset(CuCl_(2))rarrB+2H_(2)O A+B overset(hv)rarrC Then A, B and C are:

Answer»

`SO_(2),Cl_(2),SOCl_(2)`
`SO_(2),Cl_(2),SO_(2)Cl_(2)`
`SO_(3),Cl_(2),SOCl_(2)`
`SO_(3),HClO_(3),HClO_(4)`

ANSWER :B
Discussion
32.

In the following reactions,

Answer»

LIQUID WATER
STEAM
oxygen
carbon monoxide.

Solution :Water GAS is MIXED with steam.
Discussion
33.

In the following reactions, (a) H_(3)C-overset(CH_(3))overset("|")(CH)-underset(" "OH)underset(|)(CH)-CH_(3)overset(H^(+)//heat)rarr underset("product")underset("Major")(A) + underset("product")underset("Minor")(B) (b) A overset(HBr,dark)underset("in absence of peroxide")rarr underset("product")underset("Major")(C)+underset("product")underset("Minor")(D) The major products (A) and (C) are respectively:

Answer»

`CH_2=oversetoverset(CH_3)|C-CH_2-CH_3` and `CH_3-undersetunderset(BR)|oversetoverset(CH_3)|C-CH_2-CH_3`
`CH_2=oversetoverset(CH_3)|C-CH_2-CH_3` and `undersetunderset(Br)|CH_2-oversetoverset(CH_3)|CH-CH_2-CH_3`
`CH_2-oversetoverset(CH_3)|C=CH_2-CH_3` and `undersetunderset(Br)|CH_2-oversetoverset(CH_3)|CH-CH_2-CH_3`
`CH_3-oversetoverset(CH_3)|C=CH-CH_3` and `CH_3-oversetoverset(CH_3)|CH-undersetunderset(Br)|CH-CH_3`

SOLUTION :
Discussion
34.

In the following reaction xZn+yHNO_(3)("dil") rarr aZn(NO_(3))_(2)+bH_(2)O+cNH_(4)NO_(3) What is the sum of the coefficients (a+b+c)

Answer»


Solution :BALANCE the EQUATION by any method.
`4Zn+10 HNO_(3) rarr 4 Zn(NO_(3))_(2)+3 H_(2)O+NH_(4)NO_(3)`
`:. a+b+c=4+3+1=8`
Discussion
35.

In the compound of type ECl_3 where E=B, P As, or Bi, the angle Cl-E-Cl for different E are in order:

Answer»

`BgtP=As=Bi`
`BgtPgtAsgtBi`
`BltP=As=Bi`
`BgtPgtAsgtBi`

ANSWER :B
Discussion
36.

In the compound, HCequiv C - C = CH_(2), the hybridi- zation of C-2 and C-3 carbons are respectively

Answer»

`sp^(3) and sp^(3)`
`sp^(2) and sp^(3)`
`sp^(2) and sp`
`sp^(3) and sp`

SOLUTION :`sp^(2) and sp`,
`underset(4)HC equiv underset(sp)underset(3)(C) - underset(sp^(2))underset(2)OVERSET(CH_(3))overset(|)(C) = underset(1)(CH_(2))`
Discussion
37.

In the compound formation xenon atom is in the third excited state, the expected hybridisation of xenon is

Answer»

`sp^2`
`sp^3`
`sp^3d`
`sp^3 " or " sp^3d^3`

ANSWER :D
Discussion
38.

In the following reaction X overset(Delta)to Y. X is the lowest molecular weight optically active dicarboxylic acid. What is the structure of Y.

Answer»

`CH_(3)-OVERSET(CH_(3))overset(|)(CH)-COOH`


Answer :C
Discussion
39.

In the following reaction X underset(Delta)overset("Zn dust")to Y underset("Propene")overset("(Alkylation)")to Z What is X and Z?

Answer»

X = Benzene Z = CUMENE
X = Phenol Z = Benzene
X = Phenol Z = Cumene
KOLBE - Schmitt reaction

Solution :X = Phenol Z = Cumene
Discussion
40.

In the compound [Fe(H_2O)_5NO]SO_4 the oxidation number of iron is

Answer»

1
2
3
0

Answer :A
Discussion
41.

In the following reaction, X overset("Bromination")rarr Y underset(HCl)overset(NaNO_(2))rarr Z underset(C_(2)H_(5)OH)overset("Boiling")rarr Tribomobenzene, X is

Answer»

BENZOIC acid
salicylic acid
phenol
aniline

Solution :
Discussion
42.

In the following reaction X,Y and Z are respectively :

Answer»




SOLUTION :
Discussion
43.

In the compound CH_2=CH-CH_2-CH_2-C-=CH, the C_2-C_3 bond is of the type

Answer»

`sp-sp^2`
`sp^3-sp^3`
`sp-sp^3`
`sp^2-sp^3`

SOLUTION :
HENCE, `C_2` and `C_3` are `sp^2` and `sp^3`-HYBRID
Discussion
44.

In the compound CoCl_(3).5NH_(3) :

Answer»

all the cl show PRIMARY valency (PV) only
two cl show (PV) and one Cl SECONDARY valency (SV)
two Cl show (PV) and one Cl (PV) as well as (SV)
all the Cl show (SV)

Solution :`Co(NH_(3))_(5)UNDERSET(PV + SV)underset(DARR)(Cl) underset(PV only)underset(darr)(Cl_(2))`
Discussion
45.

In the complexes [SbF_(5)]^(2-),sp^(3)d hybridisation is present. Geometry of the complex is:

Answer»

SQUARE PYRAMIDAL
Square bipyramidal
TETRAHEDRAL
square PLANAR

ANSWER :A
Discussion
46.

In the following reaction, X is X overset("Bromination")to Y overset(NaNO_(2)//HCl)to Z underset(C_(2)H_(5)OH)overset("Boilng")to Tribromobenzene

Answer»

BENZOIC acid
Salicylic acid
Phenol
Aniline.

Answer :D
Discussion
47.

In the complex [Pt(NO)_(2)(H_(2)O)(NH_(3))_(2)]Br, identify the followin (i) Central metal atom/ion (ii) Ligand(s) and their types (iii) Coordinates entity (iv) Oxidation number of the central metal ion (v) Coordination number

Answer»

Solution :`(i)` Central METAL ion `-PT^(2+)`
`(ii)` Ligands and their types `-NO_(2)-` MONO dendate ligand,
`H_(2)O` and `NH_(3)`- neutral monodendate ligand
`(iii)` Coordinates entity `=[Pt(NO_(2))(H_(2)O)(NH_(3))_(2)]^(+)`
`(iv)` Oxidation NUMBER of the central metal ion `-x+1(-1)+1(0)+1(0)=+1`
`x-1=+1`
`x=+2`
`(v)` Coordination number `-4`
Discussion
48.

In the following reaction, X is X overset("Bromination")(rarr) Y underset(+HCl)overset(NaNO_(2))(rarr) Z underset(C_(2)H_(5)OH)overset("Boiling")(rarr) underset("Benzene")("Tribromo")

Answer»

BENZOIC ACID
Salicyclic acid
Phenol
Aniline.

Solution :
Discussion
49.

In the complexes [Fe(H_(2)O)_(6)]^(3+), [Fe(CN)_(6)]^(3-), [Fe(C_(2)O_(4))_(3)]^(3-) and [FeCl_(6)]^(3-), more stability is shown by

Answer»

`[FE(H_(2)O)_(6)]^(3+)`
`[Fe(CN)_(6)]^(3-)`
`[Fe(C_(2)O_(4))_(3)]^(3-)`
`[FeCl_(6)]^(3-)`

Solution :Because of chelation.
Discussion
50.

In the following reaction, X isX overset"Bromination"to Y overset(NaNO_2//HCl)to Z underset(C_2H_5OH)overset"Boiling"to Tribromobenzene

Answer»

Benzoic acid
Salicyclic acid
Phenol
Aniline

Solution :Proceed BACKWARD , tribromobenzene is produced by boiling compound Z with `C_2H_5OH`, Z in turn is obtained by DIAZOTISATION of Y, so Y and Z should have `-NH_2` and `-N_2Cl` GROUPS RESPECTIVELY, in addition to three Br atoms. Hence X should be `C_6H_5NH_2`
Discussion