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 primitive unit cell the length of all sides are unequal and angles are unequal to 90^@ ?

Answer»

TETRAGONAL 
HEXAGONAL 
MONOCLINIC 
TRICLINIC 

ANSWER :D
Discussion
2.

In which pair the first atom or ion is not larger than the second :-

Answer»

N, F
`Cl^(-),Cl`
O, S
`Fe^(2+), Fe^(3+)`

SOLUTION :`(i) N GT F (ii) Cl^(-) gt Cl (iii) O lt S (iv) Fe^(+2) gt Fe^(+3)`
Discussion
3.

In which pair, second atom is larger than the first :

Answer»

BR, Cl
Na,Mg
Sr, Ca
N, P

Answer :D
Discussion
4.

In which pair of ions both the species contain S-Sbond ?

Answer»

`S_(4)O_(6)^(2-), S_(2)O_(3)^(2-)`
`S_(2)O_(7)^(2-), S_(2)O_(8)^(2-)`
`S_(4)O_(6)^(2-), S_(2)O_(7)^(2-)`
`S_(2)O_(7)^(2-), S_(2)O_(3)^(2-)`

SOLUTION :Both `S_(4)O_(6)^(2-) and S_(2)O_(3)^(2-)` CONTAIN S-S bonds.
Discussion
5.

In which pair of ions both the species contain S-S bond ?

Answer»

`S_(4)O_(6)^(2-), S_(2)O_(3)^(2-)`
`S_(2)O_(7)^(2-), S_(2)O_(8)^(2-)`
`S_(4)O_(6)^(2-), S_(2)O_(7)^(2-)`
`S_(2)O_(7)^(2-), S_(2)O_(3)^(2-)`

Solution :
Discussion
6.

In which pair most efficient packing is present?

Answer»

HCP and bcc 
hcp and ccp 
bcc and ccp 
bcc and simple CUBIC cell 

Solution :hcp and ccp both have 74 % of packing EFFICIENCY. bcc and simple cubic cell have 68 % and 52.4 % of packing efficiency RESPECTIVELY.
Discussion
7.

In which pair most efficient packing is present ?

Answer»

HCP and BCC
hcp and ccp
bcc and ccp
bcc and SIMPLE cubic cell

Solution :In hcp and ccp, SPACE occupied = 74% WHEREAS it is only 68% in bcc.
Discussion
8.

In which pair highest oxidation states of transition metals are found

Answer»

nitriles and CHLORIDES
fluorides and chlorides
fluorides and OXIDES
nitriles and oxides

Answer :C
Discussion
9.

In which pair both are not isostructural :-

Answer»

`BH_(4)^(-) & AlH_(4)^(-)`
`NH_(4)^(+) & PH_(4)^(+)`
`PCl_(6)^(-) & [SiF_(6)]^(-2)`
`BCl_(4)^(-) & I Cl_(4)^(-)`

Solution :`underset("tetrahedral")underset("lp"=0)underset(sp^(3))(BCl_(4)^(-))"" underset("square PLANAR")underset("lp"=2)underset(sp^(3)d^(2))(ICl_(4)^(-))`
Discussion
10.

In which ot the following Kharsch-Myo effect operate?

Answer»

`CH_(3)CH=CHCH_(3)+HBR`
`CH_(3)CH_(2)CH=CH_(2)+HBr`
`CH_(3)CH_(2)CH=CH_(2)+HCl`
`CH_(3)CH=CH_(2)+HI`

Answer :B
Discussion
11.

In Which order of reaction, rate of reaction becomes equal to specific reaction rate ?

Answer»

Solution :Zero ORDER reaction `(DX)/(dt) = K`.
Discussion
12.

In which option ,properties of the given three complexes are correct ? [Ni(CN)_(4)]^(2-)""[Ni(Cl)_(4)]^(2-)""[Ni(CO)_(4)]

Answer»

Square PLANAR paramagnetic `mu=root_(8)B.M`.
`mu=0` tetrahedral diamagnetic
Diamagnetic `mu=root_(8)B.M.` square planar
Square planar diamagnetic tetrahedral

Solution :`[Ni(CN)_(4)]^(2-) implies diamagnetic, SQR. Planar`,
`[NiCl_(4)]^(2-) implies "paramagnetic, tetrahedral"`
Discussion
13.

In which operations , the formula of NaCl remains same ?

Answer»

On passing one body-DIAGONAL plane in unit cell and all the ions are removed TOUCHING body-diagonal plane
On passing one reactangular plane in unit cell and all the ions are removed touching RECTANGULAR plane
On passing tetrad axis in unit-cell and all the ions are removed touching the tetrad axis
On passing body-diagonal LINE in unit cell and all the ions are removed touching the body diagonal line

Answer :A::B::C
Discussion
14.

In which one of the two structures, NO_(2)^(+) and NO_(2)^(-) the bond angle has a higher value ?

Answer»

SOLUTION :Bond angle has a higher value in` NO_2^+` because of the ABSENCE of LONE PAIR-bond pair REPULSION.
Discussion
15.

In which one of the two structures NO_(2)^(+) and NO_2^(-), the bond angle has a higher value ?

Answer»

SOLUTION :BOND angle has a higher value in` NO_2^+` because of the absence of lone PAIR-bond pair repulsion.
Discussion
16.

In which one of the pairs of ion given, there is an ion that forms a co-ordination compound with bothaqueous sodium hydroxide and ammonia and an other ion that forms a co-ordination compound only with aqueous sodium hydroxide?

Answer»

`PB^(2+), CU^(2+)`
`Zn^(2+), Al^(3+)`
`Cu^(2+), Zn^(2+)`
`Al^(3), Cu^(2+)`

Solution :`Zn^(2+)` ion reacts with aq. NAOH and `NH_(3)` and FORMS a coordination compound.
`Zn^(2+)+4NaOH RARR [Zn(OH)_(4)]^(2-)+4Na^(+)`
`Zn^(2+)+4NH_(3) rarr [Zn(NH_(3))_(4)]^(2+)`
But, `Al^(3+)` ion reacts only with NaOH.
`Al^(3)+4NaOH rarr [Al(OH)_(4)]^(-)+4Na^(+)`
Discussion
17.

In which one of the following type of polymerization generally no initiator is required

Answer»

CATIONIC POLYMERIZATION
ANIONIC polymerization
Free RADICAL polymerization
CONDENSATION polymerization

Answer :D
Discussion
18.

In which one of the following two structures NO_2^(+) and NO_2^(-) the bond angle has a higher value ?

Answer»

Solution : BOND angle has a HIGHER value in `NO_2^(+)` because of weaker lone PAIR-bond pair REPULSION.
Discussion
19.

In which one of the following the BOD (Biochemical OxygenDemand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order

Answer»

SE LT S lt PE lt DE
SE lt PE lt S lt DE
PE lt S lt SE lt DE
S lt DE lt PE lt SE

Solution :Usually, BOD of PE =30 mg/lit., S=300-400 mg/lit., SE=2000-3500 mg/lit., and DE =3400 mg/lit. THEREFORE PE lt S lt SE lt DE
Discussion
20.

In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three ?

Answer»

`SbCl_(5)^(2-)`
`PCl_(5)`
`SF_(4)`
`I_(3)^(-)`

Solution :SB `Cl_(5)^(2-)` involves `sp^(3)d^(2)` HYBRIDIZATION of Sb while all other molecules / ions involve `sp^(3)d` hybridization.
Discussion
21.

In which one of the following reactions, nitrogen is not reduced?

Answer»

`NO_2to NO_(2)^(-)`
`NO_(3)^(-)to NO`
`NO_(3)^(-) toNH_(4)^(+)`
`NH_(4)^(+)toN_2`

Solution :`overset(+4) ( NO_(2)to overset(+3) (NO_(2)^(-)) , overset(+5) (NO_(3)) tooverset(+2) (NO)`
`overset(+5)(NO_(3)^(-) )to overset( -3) (NH_4^( +)) , overset(-3) (NH_(4)^( +)to overset( 0 )N_2`
Discussion
22.

In Which one of the followingpoly substitution otakes place?

Answer»




Solution :SINCE `CH_(3)` group is electron donating, hence electron in toulence is higher than in benzene and hence poly-substitution occurs during FC alkylation when the benzene ring CONTAINS electron donating groups. All other grous (i.e. `CH_(3)CO,NO_(2) and SO_(3)H)` are electron WITHDRAWING and the hence in these CASES polysubstitution does not occur
Discussion
23.

In which one of the following reactions, 16 group element is precipitated

Answer»

`NA _(2) SO_(3) + Cl_(2) + H_(2)O to `
`SO_(2) + 2H_(2) O+ CL _(2)to`
`2FeSO_(4) + H_(2) SO _(4) + Cl _(2) to `
`Na_(2) S_(2) O _(3) + Cl _(2) + H_(2) O to `

Answer :D
Discussion
24.

In which one of the following pairs the two species are both isoelectronic and isotopic (Atomic number : Ca = 20, Ar = 18, K = 19, Mg = 12, Fe = 26, Na = 11)

Answer»

`.^(40)Ca^(2+) and .^(40)AR`
`.^(39)K^(+) and .^(40)K^(+)`
`.^(24)Mg^(2+) and .^(25)Mg`
`.^(23)Na and .^(24)Na^(+)`

SOLUTION :`.^(39)K^(+) and .^(40)K^(+)` contains same number of electrons so they are Isoelectronic. They have same atomic numbers but different mass numbers so they are ALSO Isotopes.
Discussion
25.

In which one of the following pairs the radius of the second species is greater than that of the first ?

Answer»

`O^(-2), N^(-3)`
Na, Mg
Al, Be
`LI^(+), Be^(+2)`

ANSWER :A
Discussion
26.

In which one of the following oxides carbon is not used as a reducing agent?

Answer»

`Fe_(2)O_(3)`
PBO
`SnO_(2)`
`Al_(2)O_(3)`

ANSWER :D
Discussion
27.

In which one of the following one faraday of electricity liberates 1/2 gram atom of the metal ?

Answer»

`AuCl_(3)`
`Fe Cl_(3)`
`CuSO_(4)`
`NaCl`

Answer :C
Discussion
28.

In which one of the following gaseous equlibria K_(p) is less then K_(c)

Answer»

`N_(2)O_(4)hArr2NO_(2)`
`2HlhArrH_(2)+I_(2)`
`2SO_(2)+O_(2)hArr2SO_(3)`
`N_(2)+O_(2)hArr2NO`

Solution :`K_(p)=K_(c)(RT)^(Deltan)`
`Deltan=-"for reaction"2SO_(2)+O_(2)hArr2SO_(3)`
So for this reation `K_(p)` is less than `K_(c).`
Discussion
29.

In which one of the following halides, C_(sp^2) - X bond is present?

Answer»

Allyl halides
Benzyl HALIDE
ARYL halide
Alkyl halide

ANSWER :C
Discussion
30.

In which one of the following equlibria, the increase of pressure over the equlibrium will favour the backward reaction

Answer»

Decomposition equlibrium of HI
Formation equlibrium of `SO_(3)`
Decomposition equlibrium of `NH_(3)`
Formation equlibrium of `PCl_(5)`

Solution :According to Le-Chatelier's principle, if a system at equlibrium is SUBJECTED toa change of concentration, pressure of temperatue, the equlibrium shifts in the directin that tends to undo the EFFECT of the change. When the pressure on the systyem is increased, the equlibrium will shift in the DIRECTON in which there is decrease in NUMBER of moles.
(a) `2HIhArrH_(2)+I_(2)`
(b) `SO_(2)+1//2O_(2)hArrSO_(3)`
(c) `2NH_(3)hArrN_(2)+3H_(2)`
(d) `PCl_(3)+Cl_(2)hArrPCl_(5)`
So, in reaction (c) the increase in pressure will favour backward reaction.
Discussion
31.

In whichone of the following dpi - p pibond is present -

Answer»

<P>`NO_(3)^(-), NO_(2)^(-) , N^(3-), CN^(-)`
`P_(2)O_(3),P_(2)O_(4), PO_(4)^(3-)`
`NH_(3), PH_(3), BiH_(3)`
`CO,NO,CO_(2)

ANSWER :B
Discussion
32.

In which one of the following conversions phosphorus pentachloride is used as a reagent

Answer»

`H_(2)C=CH_(2)toCH_(3)CH_(2)Cl`
`H_(3)C-O-CH_(3)toCH_(3)Cl`
`CH_(3)CH_(2)OHtoCH_(3)CH_(2)Cl`
`HC-=CHtoCH_(2)=CHCl`

Solution :`CH_(3)-O-CH_(3)+PCl_(5)to2CH_(3)Cl+POCl_(3)`
`CH_(3)CH_(2)OH+PCl_(5)toCH_(3)CH_(2)Cl+HCl+POCl_(3)`
So, both reaction carried out by `PCl_(5)`.
Discussion
33.

In which one of the following, does the given amount of chlorine exert the least pressure in a vessel of capacity 1" cm"^(3) at 273 K ?

Answer»

`0.0355` g
`0.071 g`
`6.023xx10^(21)` molecules
`0.02` MOLE

SOLUTION :`Ppropn` (no. of moles)
Molecular weight of chlorine `=71` g
`0.0355g=5xx10^(-4)` moles
`0.071g=1xx10^(-3)` moles
`6.023xx10^(21)` molecules `=0.01` moles `0.02` moles `=0.02` moles
Discussion
34.

In which of the reactions, the enthalpy is the least

Answer»

`CH_(3)COOH + NaOHrArr CH_(3)COONa + H_(2)O`
`HCl + NH_(4)OH rArr NH_(4)CL + H_(2)O`
`HCl + NaOHrArr NACL + H_(2)O`
`HCN + NH_(4)OH rarr NH_(4)CN + H_(2)O`

Answer :C
Discussion
35.

In which of these cyclic compounds you find the minimum angle strain?

Answer»

`C_3H_6`
`C_4H_8`
`C_5H_10`
`C_6H_12`

ANSWER :D
Discussion
36.

In which of the reactions ,tert-formed

Answer»

`C_6H_6+(CH_3)_2C=CH_2overset(HF//BF_3)to`
`C_6H_6+CH_3CH_2CH_2Cl OVERSET(AlCl_3)to`
`C_6H_6+(CH_3)_2CH-CH_2Cloverset(HF//BF_3)to`

ANSWER :A::C::D
Discussion
37.

In which of the reaction CO_(2) gas will evolve?

Answer»

`Ph-OVERSET(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-OH underset(Delta)to`

`Ph-CO_(2)H overset(NaHCO_(3))underset(Delta)to`
All

Answer :D
Discussion
38.

In which of the reaction formation of Diazonium salt takes place ?

Answer»




ANSWER :A
Discussion
39.

In which of the ion pairs, magnetic property depends on the strngth of ligand present in the complex ?

Answer»

`TI^(3+), V^(3+)`
`Cr^(3+), Mn^(4+)`
`Cr^(2+), Mn^(3+)`
`Mn^(2+), Fe^(3+)`

Solution :`d^(4)` to `d^(7)` configuration are AFFECTED by strength of ligand. `Cr^(2+) to d^(4),Mn^(3+) to d^(4),Mn^(2+) to d^(5),Fe^(3+) to d^(5)`
Discussion
40.

In which of the lanthanide elements, 5d elements does not shift to 4f orbita ls ?

Answer»

CE, Eu, Yb
La, GD, LU
Ce, Nd, Dy
Sm, HO, Er

Solution :`La(57) to [XE] 6s^2 5d^1 4f^0`
Gd (64) `to [Xe] 6s^2 5d^1 4f^7`
`Lu (71) to [Xe ] 6s^2 5d^14f^14`
Discussion
41.

In which of the given galvanic cells does the following reaction occuu - 2AgCl(s)+H_(2)(g)rarr 2Ag(s)+2HCl (aq)

Answer»

`Pt|H_(2)(G)|KCL(aq)|AGCL(s)|AG`
`Pt|H_(2)(g)|HCL(aq)|Ag^(+)(aq)|Ag`
`Pt|H_(2)(g)|HCl(aq),AgCl(s)|Ag`
`Pt|H_(2)(g)|HCl(aq)|Ag|AgCl(s)`

ANSWER :C
Discussion
42.

In which of the given species, carbanion is sp^3 hybridised?

Answer»




ANSWER :A
Discussion
43.

In which of the follwing cells net cell reaction is :

Answer»

` Ag|AfCl(s)|KCl(AQ)||NH_4NO_3AgNO_3|Ag`
`Ag|AfCl(s) |CL(a)|Ag`
`Ag|AfNO_3||NH_4NO_3||KCl(aq)|AgCl|Ag`
All of the above

Solution :` Ag|AfCl(s) |LCL(aq)||NH_4NO_3||AgNO_3|Ag`
SALT bridge
LHE reaction : `Ag+Cl^- rarr AgCl(s) +e`
RHE reaction : `Ag^+ +e rarr Ag`
Net reaction :`Ag^+ + Cl^- rarr AgCl(s)`.
Discussion
44.

In which of the following zones of atmosphere ozone layer is present ?

Answer»

Troposphere
Stratosphere
Mesosphere
Exosphere

Answer :B
Discussion
45.

In which of the following would be decarboxylates readily when heated ?

Answer»




ANSWER :C::D
Discussion
46.

In which of the following will Kharasch effect operate:

Answer»

`CH_2CH_2CH=CH_2+HCI`
`CH_3CH_2-CH=CH_2_HBr`
`CH_3CH=CH-CH_3+HBr`
`CH_3CH_2CH=CH_2+HI`

ANSWER :C
Discussion
47.

In which of the following will the corrosion of iron be most rapid ?

Answer»

In PURE WATER
In pure oxygen
In AIR and MOISTURE
In air and SALINE water

Answer :D
Discussion
48.

In which of the following will the corrosion of iron be most rapid :

Answer»

In pure water
In pure oxygen
In AIR and moisture
In air and saline water

ANSWER :D
Discussion
49.

In which of the following tyndal effect is observed ?

Answer»

solvent
solution 
precipitate
colloidal SOL 

ANSWER :D
Discussion
50.

In which of the following Tyndall effect is not observed -

Answer»

Suspensions
Emulsions
Sugar solution
Gold sol.

Answer :C
Discussion