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.

Among the following the maximum covalentcharacteris shown by the compound:

Answer»

`SnCl_(2)`
`AlCl_(3)` and `SiCl_(4)`
`MgCl_(2)`
`FeCl_(2)`

SOLUTION :Greaterthe CHARGE and smallerthe SIZE of the cation(i.e, `Al^(3+)`), greater the charge DENSITY,greater the polarization hencegreater isthe COVALENT character. i.e., `AlCl_(3)`.
Discussion
2.

Among the following , the maximum covalent character is shown by-

Answer»

`FeCl_(2)`
`SnCl_(2)`
`AlCl_(3)`
`MgFl_(2)`

Solution :Ionic potential `(phi)` of the cations increase with increase in CATIONIC CHARGE and decrese in cationic radii. Thus, the resulting compound POSSESSES more colalent character, so, `AlCl_(3)` exhibits maximum COVALENCY.
Discussion
3.

Among the following , the least thermally stable is

Answer»

`K_(2)CO_(3)`
`Na_(2)CO_(3)`
`BaCO_(3)`
`Li_(2)CO_(3)`

Solution :Among `Li^(+) , Na^(+) , K^(+)` and `Ba^(2+) , Li^(+)` has the smallest size and hence the highest POLARISING power . As a result , `Li_(2)CO_(3)` has the least ionic CHARACTER and hence has the least stability .
Discussion
4.

Among the following the least thermally stable is

Answer»

`K_2CO_3`
`Na_2CO_3`
`BaCO_3`
`Li_2CO_3`

SOLUTION :`Li_2CO_3` is LEAST STABLE.
Discussion
5.

Among the following the least thermally stable is ………… .

Answer»

`K_(2)CO_(3)`
`Na_(2)CO(3)`
`BaCO_(3)`
`Li_(2)CO_(3)`

SOLUTION :`Li_(2)CO_(3)` is LEAST stable
Discussion
6.

Among the following , the least stable resonance structure is

Answer»




SOLUTION :Resonance structure (a) in which the positive charges are PRESENT on the adjacent atoms is EXPECTED to be least STABLE.
Discussion
7.

Among the following, the least stable resonating structure is :

Answer»




ANSWER :A
Discussion
8.

Among the following, the least stable resonance structure is

Answer»




ANSWER :A
Discussion
9.

Among the following, the formula of saturated fatty acid is

Answer»

`C_(17)H_(29)COOH`
`C_(17)H_(35)COOH`
`C_(7)H_(31)COOH`
`C_(17)H_(33)COOH`

Answer :B
Discussion
10.

Among the following, the correct statement(s) is(are)

Answer»

`Al(CH_(3))_(3)` has the three-centretwo-electron bonds in its DIMERIC strucutres
`BH_(3)` has the three-centre two-electrons bonds in its dimeric structure
the Lewis acidity of `BCl_(3)` is GREATER than that of `AlCl_(3)`
`AlCl_(3)` has the three-centre two-electron bondsin its dimericstructure.

Solution :In dimeric structureof `AlCl_(3)`, the bridged Cl forms a convalentbond with oneCl atom and coordinate bond with the other. As such it does havea `3c-3c` bond asin `Al_(2)(CH_(3))_(6)` and `B_(2)H_(6)`.The option (d) is not correct while all other options (a,b,c) are correct.
Discussion
11.

Among the following the compound that contains , ionic, covalentand coordinate linkage is ………….

Answer»

`NH_4 CL`
`NH_3`
`NACL`
`KCL`

SOLUTION :`NH_4 Cl`
Discussion
12.

Among the following , the compound that contains, ionic , covalent and co-ordinate linkage is

Answer»

`NH_(4)Cl`
`NH_(3)`
`NACL`
NONE of these

Solution :`NH_(4)Cl`
Discussion
13.

Among the following the compound having the highest enol content :

Answer»

`CH_(3)COOCH_(3)`
`CH_(3)COCH_(3)`
`CH_(3)-underset(O)underset(||)C-CH_(2)CHO`
`CH_(3)-CO-CH_(2)-CO_(2)CH_(3)`

Solution :N//A
Discussion
14.

Among the following the aromatic compound is

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ANSWER :A
Discussion
15.

Among the following the aromatic compounds is

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SOLUTION :Only (a) has `2pi`-ELECTRONS and hence is aromatic. All others have `4 pi` electrons and hence are ANTIAROMATIC.
Discussion
16.

Among the following , the alkene on ozonolysis giving rise to onlyone aldehyde as the product , is

Answer»

1-butene
propene
2-butene
2-methylprop-1-ene

Answer :C
Discussion
17.

Among the following, the applications of Graham's law are a) In Marsh gas alarm b) In designing eudiometer c) In separating uranium isotopes d) To measure volume of a gas by gas burette

Answer»

a, c 
B, d 
c, d 
b, d 

Solution :It is USED in Ansil.s alarm and to separate URANIUM ISOTOPES.
Discussion
18.

Among the following, the air pollutants are _____ CO,CO_(2), N_(2),O,NO,SO_(2),O_(3),CH_(4)

Answer»


ANSWER :7
Discussion
19.

Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is

Answer»

`R_(2)SiCl_(2)`
`RSiCl_(3)`
`R_(3)SiCl`
`R_(4)Si`

ANSWER :B
Discussion
20.

Among the following substitutedsilanes, the one which will give rise to cross-liked silicone polymeron hydrolysis is

Answer»

`R_(3)SICL`
`R_(4)Si`
`RSiCl_(3)`
`R_(2)SiCl_(2)`

SOLUTION :`RSiCl_(3)` givescross-linkedpolymer.
Discussion
21.

Among the following structures the one which is not a resonating structure of others is

Answer»

I
II
III
IV

Answer :D
Discussion
22.

Among the following statements which one is/are correct :

Answer»

Cyanic ACID `(H-O-CequivN)` and isocyanic acid (H - N = C = O) are not separable in `H_(2)O`
Ka of formic acid is higher than IInd `Ka(Ka_(2))` of OXALIC acid.
Acids which are weaker than `H_(2)CO_(3)` will LIBERATE `CO_(2)` on treatment with `NaHCO_(3)`
In case of dicarboxylic acid `Ka_(1)` (1st dissociation), is always GREATER then `Ka_(2)` (IInddissociation)

Solution :Acids which are weaker than `H_2 CO_3` will liberate `CO_2` on treatment with `NaHCO_3`
Discussion
23.

Among the following statements, which on is/are correct? (i) During cyclic process the amount of heat absorbed by the surrounding is equal to work done on the surrounding. (ii)Refractive index is an example for intensive property. (iii)If the enthalpy change of a process is positive then the process is spontaneous. (iv)If the enthalpy change of a process is positive then the process is spontaneous.

Answer»

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

Solution :(ii)only
Discussion
24.

Amongst the following statements, which is(are) correct ?

Answer»

CYANIC acid `(H-O-CequivN)` and isocyanic acid (H - N = C = O) are not separable in `H_(2)O`
Ka of formic acid is higher than IInd `Ka(Ka_(2))` of oxalic acid.
Acids which are weaker than `H_(2)CO_(3)` will liberate `CO_(2)` on treatment with `NaHCO_(3)`
In case of dicarboxylic acid `Ka_(1)` (1st dissociation), is always GREATER then `Ka_(2)` (IInddissociation)

Answer :A::B::D
Discussion
25.

Among the following statements on the nitration of aromatic compounds, find the number of false statement(s)? i) The rate of benzene is almost the same as that of hexadeuterobenzene. ii) Loss of aromaticity when overset(oplus)NO_2 attacks at ortho and Para position and not at Meta position. iii) Nitrobenzene prepared from benzene by using a mixture of conc. HNO_3 and conc. H_2SO_4 inwhich HNO_3 act as a base iv) Nitration is an electrophilic substitution reaction.

Answer»


SOLUTION :NITRATION of AROMATIC COMPOUNDS
Discussion
26.

Among the following statements a) If two salts have equal solubility then their solubility products are equal. b) BaSO_(4) , in more soluble in water than in dil. H_(2),SO_(4) ( c)When KI is added to Pbl_(2), then the[Pb^(2+)] decreases d) In any solution containing AgCI, the value of [Ag^(+)] [CI^(-)] is constant at constant temperature.

Answer»

All are correct
a,B and d are correct
a,c and d are correct
b,c and d are correct

Solution :EVEN if S is same, Kspneed not be same
(b)due to common ION effect SOLUBILITY iin ` H_2SO_4` decreases
( c )due to common ion effect , solubility in KIdecreases
(d) ` [Ag^(+) ] [Cl^(-) ] =` Ksp (constant
Discussion
27.

Among the following species, identify the isostructural parisNF_(3), NO_(3)^(-) , BF_(3), H_(3)^(+) O , HN_(3)

Answer»

`[NF_(3),NO_(3)^(-)] and[ BF_(3), H_(3)^(+) O]`
`[NF_(3), NH_(3)] and [NO_(3)^(-), BF_(3)]`
`[NF_(3),H_(3)^(+)o] and [NO_(3)^(-), BF_(3)]`
`[NF_(3), H_(3)^(+) O] and [HN_(3), BF_(3)]`

Solution :`NF_(3) and H_(3) O^(+)`are pyramidal (`SP^(3)` hybridised )
WHEREAS `NO_(3)^(-) and BF_(3)` are triangular PLANAR `(sp^(2)`
hybridised ) `NH_(3)` has a bent structure
Discussion
28.

Which one of the following pairs of ions have the same electronic configuration

Answer»

`Ti^(2+), V^(3+), CR^(4+) , MN^(5+)`
`TI^(3+), V^(2+) , Cr^(3+), Mn^(4+)`
`Ti^(4+) , V^(4+) , Cr^(6+) , Mn^(7+)`
`Ti^(4+) , V^(3+) , Cr^(2+) , Mn^(3+)`

Solution :`Ti^(2+) - [Ar] 4s^0 3d^2 , V^(3+) -[Ar] 4s^0 3d^2`
`Cr^(4+) - [Ar] 4s^0 3d^2 , Mn^(5+) - [Ar] 4s^0 3d^2`
Discussion
29.

Among the following reactions which one has K_(P) = K_(C) ?

Answer»

`N_(2) O_(4) hArr 2NO_(2) (G)`
`2 SO_(2) (g) + O_(2) (g) hArr 2 SO_(3) (g)`
`N_(2) (g) + O_(2) (g) hArr 2 NO (g)`
`N_(2) (g) + 3 H_(2) (g) hArr 2 NH_(3) (g)`

Solution :`K_(p) = K_(C) . RT^(Delta_(n) g)`
In EQUATION `N_(2) (g) + O_(2) (g) hArr 2 NO (g)`
`Deltan_(g) = 0`
`therefore K_(p) = K_(C) . RT^(0)`
`K_(P) = K_(C)`
Discussion
30.

Among the following representations of excited states of atoms which is impossible ?

Answer»

`1s^2 2s^1`
`3s^2 3p^3 4s^1`
`1s^2 2s^2 2p^4 3s^2`
`[NE]3s^2 3p^6 3d^2 4s^3`

SOLUTION :`4s^3` is not POSSIBLE
Discussion
31.

Among the following , reaction(s) which gives(give) tert-butyl benzene as the major product is(are)

Answer»




ANSWER :B::C::D
Discussion
32.

Among the following reaction(s) which gives(give) tert-butyl benzene as the major product is(are)

Answer»

Solution :Rearrangement POSSIBLE in the presence of ACIDIC MEDIUM, sodium ethaoxide is a STRONG base it GIVES`E_(2)` elemination.
Discussion
33.

Among the following reaction(s) which gives (give) tert-butylbenzene as the major product is/(are)

Answer»





SOLUTION :Dehydrohalogenation results in ISOBUTYLENE which does not react with BENZENE in PRESENCE of `CH_3ONa`
Discussion
34.

Among the following reactions which gives (give) tert-butylbenzene as the major product is (are)

Answer»




Solution :t-Butyl bromide on TREATMENT with NaOEt undergoes ELIMINATION to GIVE isobutylene while all the

REMAINING reactions give t-butylbenzene as the major product.
Discussion
35.

Among the following reactions, used in titrations, select the reaction (s) in which the chlorine is oxidised : 1. MnO_(2) + 4HCl to MnCl_(2)+Cl_(2)+2H_(2)O 2.2KI+Cl_(2)to 2KCl+I_(2) 3. CaOCl_(2)+H_(2)O to Ca(OH)_(2) +Cl_(2) 4. CrO_(2)Cl_(2)+2NaOH to Na_(2)CrO_(4)+2HCl

Answer»

REACTION 2, 3 and 4
reaction 1 only
reaction 1 and 3
reaction 4 only

Solution :N//A
Discussion
36.

Among the following reaction which favours forward reaction ?

Answer»

`ETOH + PhO^(Ө)hArr ETO^(Ө) + PHOH`

`Ch_(3)-OVERSET(Ө)CH_(2) + CH_(3)-NH_(2) hArr CH_(3)-CH_(3)+CH_(3)overset(Ө)NH`

Answer :C
Discussion
37.

Among the following pairs, which occurs in large amounts in sea water?

Answer»

LI, Rb
Cs, Fr
Na, K
Be, He

Answer :C
Discussion
38.

Among the following pairs, the pair that illustrates functional isomerism is

Answer»

1-butanol and 2-butanol
dimethyl ETHER and ETHANOL
cis-2-butene and trans-2-butene
ethanol and ethanal

Answer :B
Discussion
39.

Among the following pairs of orbitals which orbital will experience the larger effective nuclear charge ? (i) 2s and 3s (ii) 4d and 4f (iii) 3d and 3p

Answer»

Solution :i) `2sgt3s`
ii) `4d GT 4f`
iii) `3P gt 3D`
Discussion
40.

Givesymbolof followingspecies : (I )Numberof electronprotonandneutronin 108 and8 respectively . (ii)ca (z=20 ) andnucleon = 40 (iii)Speciesof mass number25proton12 magnesium andelectron10 (iv)Speciesof Bromine f in which( z=35)electron36 andneutron 45 .

Answer»

SOLUTION :2s , 4d and 3pexperiencemorenuclearattraction .fromthe givenpair thewhichorderof ENERGY`2s lt3s4dlt 4f3plt 3D`
Discussion
41.

Among the following pairs of orbitals which orbital will experience the larger effective nuclear charge? (a) 2s and 3s, (b) 4d and 4f, (iii) 3d and 3p

Answer»

Solution :(i) 2s is closer to the NUCLEAR than 3s. Hence, 2s will experience LARGER effective nuclear charge.
(ii) 4d (iii) 3p (for same reasons)
ALTERNATIVELY, exact CALCULATIONS can be done by applying Slater's rules GIVEN on
Discussion
42.

Among the following pairs, in which one from first species to second species decrease in radius is maximum

Answer»

`C^(4-), N^(3-)`
C,N
Ti,V
Ce,Pr

Answer :A
Discussion
43.

Among the following pairs of elements, the pair that is different from others is

Answer»

Lithium and MAGNISIUM
NITROGEN and Phosphorus
Beryllium and ALUMINIUM
BORON and Silicon

Answer :B
Discussion
44.

Among the following oxides, how many have NaCi type structure BeO, MgO, CaO, BaO, SrO

Answer»


Solution :Except Be (4 : 4 coordination) remaining oxides of IIA group elements have NaCI TYPE STRUCTURES with 6 : 6 coordination i.e MGO, CaO, BaO, SrO
Discussion
45.

Among the following observation, the correct one that differentiates between SO_(3)^(2-) and SO_(4)^(2-) is

Answer»

Both form precipitates with `BaCl_(2), SO_(3)^(2-)` DISSOLVES in HCl but `SO_(4)^(2-)` does not
`SO_(3)^(2-)` FORMS precipitate with `BaCl_(2), SO_(4)^(2-)` does not
`SO_(4)^(2-)` forms precipitate with `BaCl_(2), SO_(4)^(2-)` does not
Both forms precipitates with `BaCl_(2), SO_(4)^(2-)` dissolves in HCl but `SO_(3)^(2-)` does not

Solution :Both `SO_(3)^(2-)` and `SO_(4)^(2-)` form white precipitale with `BaCl_(2)` solution. Out of these, `BaSO_(3)` dissolves in water while `BaSO_(4)` does not.
Discussion
46.

Among the following most reactive metal is

Answer»

Mg
Na
CS 
CA 

ANSWER :C
Discussion
47.

Among the following most metallic element is

Answer»

Al
Ga
In
Tl

Answer :A
Discussion
48.

Among the following molecules, the correct order of C - C bond length is

Answer»

`C_(2)H_(6) gt C_(2)H_(4) gt C_(6)H_(6) gt C_(2)H_(2)`
`C_(2)H_(6) gt C_(6)H_(6) gt C_(2)H_(4) gt C_(2)H_(2)`
`C_(2)H_(4) gt C_(2)H_(6) gt C_(2)H_(2) gt C_(6)H_(6)`
`C_(2)H_(6) gt C_(2)H_(4) gt C_(2)H_(2) gt C_(6)H_(6)`

Answer :B
Discussion
49.

Among the following molecules in which Chlorine shows maximum oxidation state?

Answer»

`Cl_(2)`
KCl
`KClO_(3)`
`Cl_(2)O_(7)`

SOLUTION :`Cl_(2)O_(7)`
2X-14 = 0
2x = + 14
x = +7
Discussion
50.

Among the following moleculas/ions BeCl_(2) ,N_(3)^(-) ,N_(2)O,NO_(2)^(+),O_(3),SCl_(2),ICI_(2)^(-) ,I_(3)^(-) and XeF_(2), the total number of linear molecule(s)ion(s) where the hybridization of the central atom does not have contribution from the d-orbital(s) is (Atomic number : S 16, Cl =37 ,I = 53 and Xe 54)

Answer»


Solution :`BeCl_(2) to sp TP ` LINEAR`SCl_(2) to sp^(3) to ` bent
`N_(3)^(-) to sp to ` linear`I_(3)^(-) to sp^(2)d to ` linear
`N_(2)OTO sp to ` linear`Icl to sp^(3) d to ` linear
` NO_(2)^(+) to sp to ` linear`XeF_(2) to sp^(3) d to ` linear
`O_(3) to sp^(2) to ` bent
Thus , there are total four linear molecular/ions
where the hybridisation of the central atom does
not have CONTRIBUTION from the d-orbitals .
Discussion