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 oxoacids, the correct decreasing order of acid strength is

Answer»

`HClO_(2) gt HClO_(4) gt HClO_(3) gt HOCl`
`HOCl gt HClO_(2) gt HClO_(3) gt HOCl_(4)`
`HClO_(4) gt HOCl gt HClO_(2) gt HClO_(3)`
`HClO_(4) gt HClO_(3) gt HClO_(2) gt HOCl`

Solution :As the oxidation number of Cl decreases from +7 in `HClO_(4)` to +5 in `HClO_(3)` to +3 in `HClO_(2)` and +1 in HOCl, its tendency to ATTRACT the electrons of the O-H bond decreases. As a result, the tendency of the O-H bond to dissociate to give `H^(+)` ions decreases and hence the ACID strength decreases accordingly in the order : `HClO_(4) gt HClO_(3) gt HClO_(2) gt HOCl`.
Discussion
2.

Which of the following gives the correct increasing order of acidic strength ?

Answer»

`HOClgt HClO_(2) gt HClO_(3) gt HClO_(4)`
`HClO_(4) gt HOCl gt HClO_(2) gt HClO_(3)`
`HClO_(4) gt HClO_(3) gt HClO_(2) gt HCLO`
`HClO_(2) gt HClO_(4) gt HClO_(3) gt HClO`

Solution :The DECREASING order of acidic strength is :
`HClO_(4) gt HClO_(3)gt HClO_(2) gt HClO`
Discussion
3.

Among the following oxoacids, the correct decreasing order of acid strength is :

Answer»

`HClO_(4) GT HClO_(3) gt HClO_(2) gt HOCl`
`HClO_(2) gt HClO_(4) gt HClO_(3) gt HOCl`
`HOCl gt HClO_(2) gt HClO_(3) gt HOCl_(4)`
`HClO_(4) gt HOCl gt HClO_(2) gt HClO_(3)`

ANSWER :A
Discussion
4.

Among the following oxides, which has the maximum lattice energy?

Answer»

MgO
CaO
SrO
BaO

Answer :A
Discussion
5.

Among the following outermost configurations of transition which shows the highest oxidation state:

Answer»

`3d^3 4s^2`
`3d^5 4s^1`
`3d^5 4s^2`
`3d^6 4s^2`

ANSWER :C
Discussion
6.

Among the following outer electronic configurations of atoms, the highest oxidation state is exhibited by

Answer»

`(n-1)d^(8)NS^(2)`
`(n-1)d^(5)ns^(2)`
`(n-1)d^(3)ns^(1)`
`(n-1)d^(5)ns^(1)`

ANSWER :B
Discussion
7.

Among the following one with the highest percentage of chlorin is .

Answer»

Chloral
Pyrene
PVC
GAMMEXANE

Solution :% of chlorine`=("Mass of chlorine")/("Mass off ORGANIC COMPOUND")xx100`
Chloral `(C Cl_(3))=(142)/(154)xx100=92.20` HIGHEST
Gammexane `(C_(6)H_(6)Cl_(6))=(213)/(291)xx100=73.19`
Discussion
8.

Among the following order of energies of molecular orbitals of O_2 choose the correct one

Answer»

`E(pi2p_x)= E(pi2p_y)LTE(sigma2p_z)LT(Epi^ast2p_x)= E(pi^ast2+-p_y)`
`E(pi2p_x)= E(pi2p_y)gtE(sigma2p_z)GT(Epi^ast2p_x)= E(pi^ast2p_y)`
`E(pi2p_x)= E(pi2p_y)ltE(sigma2p_z)lt(Epi^ast2p_x)= E(pi^ast2p_y)`
`E(pi2p_x)= E(pi2p_y)gtE(sigma2p_z)lt(Epi^ast2p_x)= E(pi^ast2p_y)`

ANSWER :D
Discussion
9.

Among the following, one of them is not the correct match

Answer»

Silk (POLYAMIDE)
Indigo (AZO dye)
Lipase (ester)
Keratin (PROTEIN)

ANSWER :A
Discussion
10.

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

Answer»

both form precipitate with `BaCl_(2),SO_(3)^(2-)` dissolves in HCI 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_(3)^(2-)` does not
both form precipitate with `BaCl_2, SO_(4)^(2-)` dissolves in HCl but `SO_(3)^(2-)` does not

Solution :`BaCl_2` forms WHITE ppt. with both `SO_(3)^(2-)` and `SO_(4)^(2-) . BaCl_(2) + SO_(3)^(2-) to underset("white ppt.")(BaSO_(3)) DARR + 2 Cl^(-)`
`BaCl_(2) + SO_(4)^(2-) to underset("white ppt.")(BaSO_(4)) darr + 2CL^(-)`
However , only `BaSO_(3)` dissolves in HCl through following reaction :
`BaSO_(3) + 2HCL to BaCl_(2) + SO_(2) uarr + H_(2) O`
Discussion
11.

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

Answer»

Both form precipitate with `BaCl_(2), SO_(3)^(2-)` dissoves 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_(3)^(2-)` does not
Both form precipitate with `BaCl_(2),SO_(4)^(2-)` DISSOLVES in HCl but `SO_(3)^(2-)` does not.

Solution :It is the correct ANSWER. Both form white precipitates. `BaSO_(3)` dissolves in dilute HCl but `BaSO_(4)` does not.
`underset(("White ppt."))(BaSO_(3))+2HCl to underset(("soluble"))(BaCl_(2))+H_(2)O+SO_(2)`
Discussion
12.

Among the following number of correct statements are : (i) Stability of lyophilic colloids is mainly due to the strong interaction between dispersed particle and dispersion medium. (ii) Entropy change for adsorption of gases over solid is positive. (iii) Gelatin has considerably low value of gold number and is effective protective colloid. (iv) Zeta potential is also responsible for stability of lyophobic colloid solution. (v) Surface tension of lyophilic colloidal solution is lesser than that of dispersion medium.

Answer»


ANSWER :`4`
Discussion
13.

Among the following: NaOH,Ca(OH)_(2),KOH and Zn(OH)_(2), the weakest base is:

Answer»

NAOH
`Ca(OH)_(2)`
KOH
`ZN(OH)_(2)`

ANSWER :D
Discussion
14.

Among the following most polar compound is

Answer»

`XeF_(4)`


`XeF_(6)`

SOLUTION :NA
Discussion
15.

Among the following, most polar compound is -

Answer»

`XeF_4`


`XeF_6`

ANSWER :C
Discussion
16.

Among the following molecules the one with highest dipole moment is:

Answer»

`CH_(3)Cl`
`CH_(2)Cl_(2)`
`CHCl_(3)`
`C Cl_(4)`

ANSWER :A
Discussion
17.

Amongthe followingmostbaisc compoundinaqueousmediumis

Answer»




SOLUTION :Aliphaticaminesare morebasicthanaralkyl aminesandaromaticamines .
Discussion
18.

Among the following molecules :(i) XeO_(3)""(ii) XeOF_(4)"" (iii) XeF_(6) those having same number of lone pairs of Xe are:

Answer»

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

ANSWER :D
Discussion
19.

Among the following molecules how many are having sp^(3)d hybridization of this central atom ? XeOf_(2), SF_(6), SF_(4), I_(3)^(-) , BrF_(3) , XeF_(2) , POCl_(3) , ClO_(4)^(-), XeF_(4) , PCl_(3) F_(2)

Answer»


ANSWER :6
Discussion
20.

Among the following molecule which is an electron deficient compound ?

Answer»

`NF_3`
`BF_3`
`PF_3`
`AsF_3`

ANSWER :B
Discussion
21.

Among the following molecules,a) XeO_3, b) XeOF_4 " and " c) XeF_6,Those having same number of lone pairs on Xe are

Answer»

a and B
b and C
a, b and c
a and c

Answer :C
Discussion
22.

Among the following molecular orbitals , how many have only one nodal plane ? sigma1s,sigma2s,sigma**1s,pi2p_x,pi**2p_y,pi2p_y

Answer»


SOLUTION :
Discussion
23.

Among the following molecular orbitals how many have at least one nodal plane? sigma^ast1s,sigma2s,sigma^ast2p_z,pi2p_x,pi^ast2p_y, sigma 2p_z

Answer»

4
5
2
6

Answer :B
Discussion
24.

Among the following metals how many metals are extracted by self-reduction method from their respective ores. (Give total number ).Hg , Zn, Cu, Al, Mg , Pb, Fe, Sn

Answer»


ANSWER :3
Discussion
25.

Among the following metals, the most dense is :

Answer»

Osmium
Chromium
Platinum
Gold

Answer :A
Discussion
26.

Among the following metal halides, the one which is soluble in ethanol is

Answer»

`BeCl_(2)`
`MgCl_(2)`
`CaCl_(2)`
`SrCl_(2)`

Answer :A
Discussion
27.

Among the following metal carbonyls, the C-O bond order is lowest in.

Answer»

`[MN(CO)_(6)]^(+)`
`[Fe(CO)_(5)]`
`[Cr(CO)_(6)]`
`[V(CO)_(6)]^(-)`

Solution :In metal CARBONYL compound
C–O bond ORDER `prop` +ve CHARGE on central metal
`prop (1)/("-ve charge on central metal")`
Discussion
28.

Among the following metal carbonyls, the C-O bond order is lowest in

Answer»

`[Mn(CO)_(6)]^(+)`
`[Fe(CO)_(5)]`
`[Cr(CO)_(6)]`
`[V(CO)_(6)]^(-)`

Solution :An anionic carbonyl complex can delocalise more electron density to antibonding `PI`-orbital (`d pi p pi` back bonding) of CO and THUS lowers the BOND order.
Discussion
29.

Among the following metal carbonyls , the C-O bond order is lowest in :

Answer»

`[MN(CO)_(6)]^(+)`
`[V(CO)_(6)]^(-)`
`[Cr(CO)_(6)]`
`[Fe(CO)_(5)]`

ANSWER :B
Discussion
30.

Among the following, metal carbonyls, the C-O bond is strongest in :

Answer»

`[MN(CO)_(6)]^(+)`
`[Cr(CO)_(6)]`
`[V(CO)_(6)]^(-)`
`[Ti(CO)_(6)]^(2-)`

Solution :`M-C=O`
NEGATIVE charge on central atom `(uarr)`
`="M-C BE" (uarr), "M-C B.L."(DARR)`
`="C-O B.E." (darr), "C-O B.L." (uarr)`
Discussion
31.

Among the following metal carbonyl, the C-O bond order is lowest in :

Answer»

`[MN(CO)_(6)]^(+)`
`[V(CO)_(6)]^(-)`
`[CR(CO)_(6)]`
`[Fe(CO)_(5)]`

ANSWER :B
Discussion
32.

Among the following metal carbonyl carbonyl C-O bond is strongest in :

Answer»

`[Mn(CO)_(6)]^(+)`
`[CR(CO)_(6)]`
`[V(CO)_(6)]^(-)`
`[Ti(CO)_(6)]^(2-)`

Solution :As charge on C.A.`darr`,C-Obond strength `uarr`, or C-O BOND ORDER `uarr`, or C-O bond LENGTH `darr`
Discussion
33.

Among the following list of malachite ,marble anglestite ,azurtite ,dolomite ,sedererite ,calamine and chromite

Answer»


ANSWER :7
Discussion
34.

Among the following largest ion is

Answer»

`LA^(3+)`
`CE^(3+)`
`Eu^(3+)`
`LU^(3+)`

Answer :A
Discussion
35.

Among the following, L-serine is

Answer»





SOLUTION :
Discussion
36.

Among the following L-serine is

Answer»




SOLUTION :As PER EXCHANGE RULE.
Discussion
37.

Amongthe followingL - serineis ………… .

Answer»

`H_(2)N- CH_(2)- CH_(2) - CO OH`
`CH_(3) - underset(OH)underset(|)(CH) - underset(NH_(2))underset(|)(C) - CO OH`

ANSWER :C
Discussion
38.

Among the following L-serine is ………………. .

Answer»

`H_(2)N-CH_(2)-CH_(2)-COOH`
`CH_(3)-underset(OH)underset("|")"CH"-underset(NH_(2))underset("|")"C "-COOH`

ANSWER :C
Discussion
39.

Among the following isomeric C_(4)H_(11)N amines, one having the lowest boiling point

Answer»




ANSWER :D
Discussion
40.

Among the following ions, which one has the highest paramagnetism ?

Answer»

`[Cr(H_(2)O)_(6)]^(3+)`
`[Fe(H_(2)O)_(6)]^(2+)`
`[CU(H_(2)O)_(6)]^(2+)`
`[Zn(H_(2)O)_(6)]^(2+)`

Solution :`[Fe(H_(2)O)_(6)]^(2+) implies d^(6),t_(2g)^(2, 1, 1)EG^(1, 1)`
Discussion
41.

Among the following ionization processes , in which molecule bond order has increased and magnetic behaviour has changed

Answer»

`C_2toC_2^+`
`NOtoNO^+`
`O_2toO_2^+`
`N_2toN_2^+`

ANSWER :B
Discussion
42.

Among the following inert gas elements, the elements that shows highest chemical reactivity is

Answer»

Ne
Ar
He
Xe

Answer :D
Discussion
43.

Among the following, indentify the pair of antihistamine drugs

Answer»

BROMPHENIRAMINE and Terfenadine
Iproniazid and Phenelzine
Chlordiazepoxide and Equanil
Veronal and Valium

Answer :A
Discussion
44.

Among the following incorrect resonance structure of benzene diazonium ion is

Answer»




ANSWER :D
Discussion
45.

Amongthe following, identify the correct statement.

Answer»

Chloride ION is oxidised by `O_2 `
`Fe^(2+ )`is oxidised by IODINE
Iodide ionis oxidised by chlorine
`MN^(2+ )`is oxidised by chlorine

Answer :C
Discussion
46.

Among the following , identify the compound which cannot act as both oxidising and reducing agents.

Answer»

`H_(2)O_(2)`
`H_(2)`
`SO_(2)`
`HNO_(2)`

ANSWER :B
Discussion
47.

Among the following how many molecules have multiply bonds OCl_(2), H_(2) F_(2), Cl_(2) O_(7), CaOCl_(2), I_(2) Cl_(6), ClO_(2), KIO_(3), HOF

Answer»


SOLUTION :
Discussion
48.

Among the following highest melting point is associated with

Answer»

<P>`NaCI_(s)`
GRAPHITE
`P_(4)`
K

Answer :B
Discussion
49.

Among the following halogens the radioactive halogen is

Answer»

F
Cl
Br
At

SOLUTION :At (at. No. 85) is RADIOACTIVE.
Discussion
50.

Among the following halogens, the one which does not form an oxyacid is :

Answer»

FLUORINE
CHLORINE
BROMINE
Iodine

Solution :Fluorine
Discussion