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 extraction no reducing agent is required?

Answer»

IRON from haematitre
ALUMINIUM from bauxite
Magnesium from carnallite
ZINC from zinc BLENDE

Solution :Mg and AL are extracted by electrolytic reduction.
Discussion
2.

In which of the following esters the alpha - hydrogen is acidic ?

Answer»

`H-overset(O)overset("||")C-OC_(2)H_(5)`
`O_(2)N-CH_(2)-overset(O)overset("||")C-OC_(2)H_(5)`
`underset(CN)underset(|)CH_(2)-overset(O)overset("||")C-OEt`
`Ph-CH_(2)-overset(O)overset("||")C-OEt`

Answer :B::C::D
Discussion
3.

In urotropine, the number of N-N bond

Answer»

6
4
2
0

Solution :There are no N-N BONDS.
Discussion
4.

In which of the following equlibrium system is the rate of the backward reaction favoured by increase of pressure

Answer»

`PCl_(5)hArrPCl_(3)+Cl_(2)`
`2SO_(2)hArr2SO_(3)`
`N_(2)+3H_(2)hArr2NH_(3)`
`N_(2)+O_(2)hArr2NO`

Solution :The rate of BACKWARD reactin favoured by increase of pressure in the reaction as `Deltan` is positive
`PCl_(4)hArrPCl_(3)+Cl_(2)`
Discussion
5.

In upper stratospher ozone protects us from

Answer»

Infranred RADIATIONS
ultravlolet radiations
CARBON dioxide
PEROXYACETYL nitrate

ANSWER :B
Discussion
6.

In two solution having different osmotic pressure, the solution of higher osmotic pressure is called :

Answer»

ISOTONIC solution
Hypertonic solution
Hypotonic solution
None

Answer :B
Discussion
7.

In which of the following equlibrium K_(c)and K_(p) are not equal

Answer»

`2C_((s))+O_(2(g))hArr2CO_(2(g))`
`2NO_((g))hArrN_(2(g))+O_(2(g))`
`SO_(2(g))+NO_(2(g))hArrSO_(3(g))+NO_((g))`
`H_(2(g))+I_(2(g))hArr2HI_((g))`

ANSWER :A
Discussion
8.

In two different polar molecules, the ionic charge is 9.6 x 10^-10 e.s.u and 3.2 x 10^-19 coulombs respectively. If inter ionic distance in both the molecules is 1 A unit, then the dipole moment are respectively

Answer»

`4.8D, 4.8D`
`1D, 4.8D`
`9.6D`, `9.6D`
`3.33D`, `4.8D`

ANSWER :C
Discussion
9.

In which of the following equilibrium system is the rate of the backward reaction favoured by increase of pressure

Answer»

`N_(2) + 3H_(2) hArr 2NH_(3)`
`N_(2) + O_(2) hArr 2NO`
`PCl_(5) hArr PCl_(3) + Cl_(2)`
`2SO_(2) + O_(2) hArr 2SO_(3)`

Solution :ACCORDING to Le Chatelier's principle if the pressure is increased, reaction will take place in a DIRECTION which will bring about a lowering of vapour pressure. This implies that equilibrium will SHIFT in the direction which produces the smaller NUMBER of gas molecules
Discussion
10.

In twodimensionalAAAAtypesquareclosepackedstructure, thecoordinationnumberof thecompoundis _____.

Answer»

2
4
6
12

Answer :B
Discussion
11.

In which of the following equilibrium, the value of K_(p) is less than K_(c)

Answer»

<P>`H_(2)+I_(2)hArr2HI`
`N_(2)+3H_(2)hArr2NH_(3)`
`N_(2)+O_(2)hArr2NH_(3)`
`CO+H_(2)OhArrCO_(2)+H_(2)`

SOLUTION :`K_(p)=K_(c)(RT)^(DELTAN),When Deltan=2-(2+1)=-1, i.e. "negetive"K_(p)lt K_(c).`
Discussion
12.

In triple phosphate the available P_2O_5 when compared to normal super phosphate is increased by how many times ?

Answer»

Solution :Super prophate is ` ""` Triple super phosphate
`Ca(H_2PO_4)_2overset(P_2O_5)rarr""3Ca(H_2PO_4)_(2)OVERSET(3P_2O_5) rarr`
i.e., Triple super phosphate gives 3 TIMES MOLE `P_2O_5` than super phosphate
Calgen : `Na_(6)O_(18) IMPLIES (NaPO_3)rarr`
Discussion
13.

In trimetaphosphate ion, the ratio of no. of oxygen atoms and P-O-P bond is/are ___

Answer»


SOLUTION :
Discussion
14.

In which of the following equilibrium, (K_c = K_p) ?

Answer»

`[N_2(G) + O_2(g) ltimplies2NO(g)]`
`[4NH_3(g) + 5O_2(g) ltimplies 4NO(g) + 6H_2O(g)]`
`[N_2(g) + 3H_2(g)ltimplies2NH_3(g)]`
`[2NO(g) +O_2(g) ltimplies 2NO_2(g)]`

Answer :4
Discussion
15.

In which of the following equilibrium, change in the volume of the system does not alter the number of moles?

Answer»

`N_(2(G))+O_(2(g))iff2NO_((g))`
`PCl_(5(g))iffPCl_(3(g))+Cl_(2(g))`
`N_(2(g))+3H_(2(g))iff2NH_(3(g))`
`SO_(2)Cl_(2(g))iffSO_(2(g))+Cl_(2(g))`

Solution :Change in volume change the molar concentration. In (a), `n_(p)=n_(r)`. Change in volume will not alter the number of moles in this case.
Discussion
16.

In treatment of cancer, which of the following isotope is used

Answer»

<P>`._(53)I^(131)`
`._(15)P^(32)`
`._(27)Co^(60)`
`-(1)H^(2)`

Solution :`Co^(60)` is used in radiotherapy of cancer
Discussion
17.

In triethylenediamine cobalt (III) chloride the co­ordination number of cobalt is:

Answer»

3
4
6
7

Answer :C
Discussion
18.

In which of the following equilibrium, change in volume of the system does not alter the number of moles ?

Answer»

`N_(2)(g)+O_(2)(g)HARR 2NO(g)`
`PCl_(5)(g)hArr PCl_(3)(g)+Cl_(2)(g)`
`N_(2)(g)+3H_(2)(g)hArr 2NH_(3)(g)`
`SO_(2)Cl_(2)(g)hArr SO_(2)(g)+Cl_(2)(g)`

Answer :A
Discussion
19.

in transition elements, the oribitals partly or incompletely filled by electrons are _______.

Answer»

s- orbitals
p-Orbitals
d-Orbitals
f-Orbitals

Answer :C
Discussion
20.

In which of the following entropy decreases

Answer»

Crystallization of SUCROSE from the SOLUTION
Rusting of iron
Melting of ice
Vaporisation of Camphor

Solution :Because RANDOMNESS is decreases.
Discussion
21.

In transition elements, the last electron enters in the

Answer»

s-orbital of the OUTERMOST SHELL
p-orbital of PENULTIMATE shell
d-orbital of penultimate shell
f-orbital of penultimate shell

Solution :d-orbital of penultimate shell
Discussion
22.

In transforming 1 mole of PbS to PbSO_(4) the volume of '10 volume' H_(2)O_(2) required will be

Answer»

11.2 mL
22.4 mL
33.6 mL
44.8 mL

Answer :D
Discussion
23.

In which of the following entropy decreases ?

Answer»

DISSOLVING SUCROSE in WATER
Vaporisation of camphor
Melting of ice
Condensation of water vapour

Answer :D
Discussion
24.

In which of the following energy is abosrbed?

Answer»

`CL+E^(-) to Cl^(-)`
`O^(-)+e^(-) to O^(2-)`
`O^(-) -e^(-) to O^(-)`
`Na^(+) +e^(-)to Na`

ANSWER :B
Discussion
25.

In Tollen.s reagent [Ag(NH_(3))_(2)]^(+1). The oxidation number coordination number and effective atomic number of central metal ion are respectively [Atomic number of Ag = 47]

Answer»

`+1, 2, 50`
`+1, 2, 51`
`+2, 1, 50`
` +1, 1, 50`

SOLUTION :Tollen.s reagent `=[Ag(NH_(3))_(2)]^(+)`
Discussion
26.

In which of the following elements number of d-electrons is zero in 6d-obitlas?

Answer»

Th
Am
Lr
Cm

Solution :Am: `[RN] 5F^(1) 7S^(2)`
Discussion
27.

In which of the following electrochemical cell, overall cell reaction is : HgO (s) + H_2 (g) rarr Hg E + H_2O(e ).

Answer»

`Pt | H_2 (g) | H^(+) (aq) |HgO(s) |Hg|Hg€ | Pt`
`Pt|H_2(g) |NaOH (aq) |HgO (s) |HGE |Pt`
`Pt | H_2(g) |H^(+) ||NaOH(aq)| HgO(s) |Hg € |Pt`
` Pt |H-2 (g) |H^(+) ||HgO(s) |Hg€ |Pt`

SOLUTION :` Pt | H_2 (g) | NaOH (aq) | HgO (s) | Hg (l) Pt1`
` LHE` reaction : ` H_2 (g) + 2 OH^(-) H_2O (l) _2e`
` RARR Hg (l) 2OH^(-)`
NET cell reaction : ` HgO (s) + H_2 (g) rarr Hg (l) +H_2 O`.
Discussion
28.

In which of the following does adsorpttion take place and why ? (i) Silica gel placed in the atomosphere saturated with water. (ii) Anhydrous CaCl_(2) placed in the atmosphere saturated with water.

Answer»

SOLUTION :Silica gel is a GOOD adsorbent and HENCE water vapour are adsorbed on its surface. Anhydrous `CaCl_(2)` UNDERGOES abgsorption because it combine with water molecules to from hydrate calcium chloride, `CaCl_(2).2H_(2)O`
Discussion
29.

In which of the following does adsorption take place and why? (i) Silica gel placed in the atmosphere saturated with water. (ii) Anhydrous CaCl_2 placed in the atmosphere saturated with water.

Answer»

SOLUTION :(i) In silica GEL, adsorption takes PLACE. Silica gel can adsorb water molecules on its surface.
(II) It is ABSORPTION that takes place with anhydrous `CaCl_2`.
Discussion
30.

In which of the following do the ranges of temperature play an important role ?

Answer»

Electrolysis 
Liquation 
ZONE REFINING 
BLAST furnace 

ANSWER :D
Discussion
31.

In which of the following dissociation of NH_(4)OH will be minimum

Answer»

NAOH
`H_(2)O`
`NH_(4)Cl`
NaCl

Solution :When we add `NH_(4)OH` in `NH_(4)Cl` solution ionization of `NH_(4)OH` is DECREASED DUE to common ion effect.
Discussion
32.

In Tishchenko reaction an aldehyde is heated with catalyst ……

Answer»

NAOH
`AL(OC_2H_5)_3`
`Al_2O_3`
`Mg/Hg`

ANSWER :B
Discussion
33.

In which of the following dehydration by conc. H_(2)SO_(4) no rearrangement is favourable ?

Answer»




ANSWER :1
Discussion
34.

In which of the following disaccarides, the two monosaccharides are joined through their reducing groups ?

Answer»

MALTOSE
SUCROSE
LACTOSE
All the above

ANSWER :B
Discussion
35.

In which of the following defects, some of the cations are arranged in the interstitial sites?

Answer»

Schottky 
FRENKEL DEFECT 
Metal EXCESS defect 
Interstitial defect 

Answer :B
Discussion
36.

In [Ti(H_2O)_6]^(+3)complex the energy absorbed for excitation of 3d^1 electron is

Answer»

Purple
Blue
Blue-green
Red

Answer :C
Discussion
37.

In which of the following 'd' subshells are degenerate

Answer»

`Cu_((AQ))^(2+)`
`Fe_((aq))^(2+)`
`Fe_((aq))^(3+)`
`Cr_((aq))^(1+)`

Solution :`Cr_((aq))^(1+)`
Discussion
38.

In three moles of ethane (C_(2)H_(6)), calculate : (i) Number of moles of carbon atoms (ii) Number of moles of hydrogen atoms (iii) Number of molecules of ethane

Answer»

Solution :(i) 1 mole of `C_(2)H_(6)` contains 2 moles of carbon atoms
`therefore` 3 mole of `C_(2)H_(6)` will C-atoms = 6 moles
(II) 1 mole of `C_(2)H_(6)` contain 6 moles of HYDROGEN atoms
`therefore` 3 moles of `C_(2)H_(6)` will contain H-atoms = 18 moles
(III) 1 mole of `C_(2)H_(6)` contains Avogadro's no. i.e., `6.02xx10^(23)` molecules
`therefore` 3 moles of `C_(2)H_(6)` will contain ethane molecules `=3xx6.02xx10^(23)=18.06xx10^(23)" molecules"`
Discussion
39.

In which of the following d-d transitioninvolves absorption in theultraviolent region ?

Answer»


Solution :The wavelenght of lightof LIGHTABSORBED by `[CO(CN)_(6)]^(3-)` is 310 pm.This CORRESPONDS totheU.V region and not tothevisible region.
Discussion
40.

In which of the following crystal systems F.C.C unit cells exists ?

Answer»

CUBIC, hexagonal
Tetragonal, orthorhombic
Orthorhombic
Triclinic, monoclinic

Answer :C
Discussion
41.

In three beakers labelled as (A),(B) and (C ) , 100 mL of water, 100 mL of 1 M solution of glucose in water and 100 mL of 0.5 M solution of glucose in water are taken respectively and kept at same temperature . Which of the following statements is correct ?

Answer»

VAPOUR pressure in all the three beakers in same
Vapour pressure of beaker B is highest
Vapour pressure of beaker C is HIGHER
Vapour pressure of beaker B is LOWER than that of C and vapour pressure of beaker C is lower than that of A.

Solution :The vapour pressure of pure solvent is ALWAYS higher than that of a solution which CONTAINS a non-volatile solute. The decrease of lowering in vapour pressure is related to the quantity of non-volatile solte present. Hence, vapour presures follow the order : `AgtCgtB`.
Discussion
42.

In which of the following coordination entities the magnitude of Delta_(0)will be maximum?

Answer»

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

Answer :A::C
Discussion
43.

In this X is

Answer»




SOLUTION :
Discussion
44.

In which of the following crystal structure the void efficiency is 32%?

Answer»

simple cube
face CENTERED cube
HEXAGONAL CLOSE PACKING
body centered cube

ANSWER :D
Discussion
45.

In which of the following coordinaton entities the magnitude ofDelta _0 will be maximum?

Answer»

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

Answer :A
Discussion
46.

In this reaction the product (E) is

Answer»

o-nitrobenzoic ACID
SALICYLIC acid
ANTHRANILIC acid
Crotonic acid

SOLUTION :
Discussion
47.

In this reaction the major products formed are

Answer»

propyne
cyclohexene
3-cyclohexylpropyne
2-cyclohexylpropane.

Solution :
Discussion
48.

In which of the following coordination entities the magnitude fo Delta_(@) (CFSE in octahedral field ) willbe maximum ?

Answer»

`[CO(CN)_6]^(3-)`
`[Co(C_2O_4)_3]^(3-)`
`[Co(H_2O)_6]^(3+)`
`[Co(NH_3)_6]^(3+)`

ANSWER :A
Discussion
49.

In this reaction SO_(2) is (i) SO_(2)+2H_(2)S to 3S+3H_(2)O (ii) 3SO_(2)+Cr_(2)O_(7)^(2-)+2H^(+) to 2Cr^(3+)+3SO_(4)^(2-)+H_(2)O

Answer»

OXIDIZING agent both in (i) and (II)
oxidizing agent in (i) and REDUCING agent in (ii)
reducing agent both in (i) and (ii)
reducing agent in (i) and oxidizing agent in (ii)

ANSWER :B
Discussion
50.

In which of the following coordination enitities, the magnitude of Delta_(0) (CFSE in octahedral field) will be maximum ?

Answer»

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

Answer :A::C
Discussion