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.

Correct order of electron affinity of the halogen atoms is

Answer»

`F lt Cl lt Br lt I `
`F lt Cl ~ Br gt I`
`F gt Cl gt Br gt I`
`F gt Cl gt Br gt I`

Solution :Fluorine has unexpectedly less negative electron gain enthalpy than CHLORINE. Therefore, chlorine has the highest electron gain enthalpy in this group.
It is DUE to very SMALL size of fluorine atom. As a result, there are strong interelectronic repulsions in the relatively small 2P sub-shell of fluorine and thus, the incoming electron does not FEEL much attraction. Thus, electron affinity among halogen varies as, `F < Cl > Br > I`.
Chlorine has the highest electron affinity in the periodic table.
Discussion
2.

Correct order of electron affinity is/are:

Answer»

`S GT O`
`Al gt B`
`Mg gt NA`
`P gt N`

Answer :A::B
Discussion
3.

Correct order of EA is :-

Answer»

`CL gt O gt N gt C`
`Cl gt O gt C gt N`
`Cl gt N gt C gt O`
`Cl gt C gt O gt N`

Answer :B
Discussion
4.

Correct order of dehydraton of aldol:

Answer»

`IIgtIgtIII`
`IgtIIgtIII`
`IIIgtIgtII`
`IIgtIIIgtI`

ANSWER :A
Discussion
5.

Correct order of decreasing boiling points is :

Answer»

`HF gt HI gt HBR gt HCL`
`H_(2)O gt H_(2)Te gt H_(2)SE gt H_(2)S`
`Br_(2)gt Cl_(2) gt F_(2)`
`CH_(4) gt GeH_(4) gt SiH_(4)`

Answer :A::B::C
Discussion
6.

Correct order of decreasing thermal stability is

Answer»

`NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)`
`PH_(3) gt NH_(3) gt AsH_(3) gt SbH_(3)`
`AsH_(3) gt PH_(3) gt NH_(3) gt SbH_(3)`
`SbH_(3) gt AsH_(3) gt PH_(3) gt NH_(3)`

Solution :The thermal stability of hydrides of nitrogen family or GROUP 15 elements decreases on moving DOWNWARDS in the group. THEREFORE, `NH_(3)` is the most stable and `BiH_(3)` is the least stable. The stability of the hybrides of group 15 elements decreases in the ORDER : `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_3`
Discussion
7.

Correct order of bond length of p,q,r,s in following compound is CH_(3)-overset(O)overset(||)Cunderset((g))-O^(-) H-underset(O)underset(||(q))C-H CH_(3)overset((g))-OH .^(-)O-underset(O)overset(||)Coverset((s))-O^(-)

Answer»

`pltsltqltr`
`sltpltqltr`
`rltqltsltr`
`qltpltsltr`

SOLUTION :`CH_(3)-overset(O)overset(||)C-O^(-)harrCH_(3)-underset(O^(-))underset(|)C=O` B.O. of 'p' BOND `=(1+2)/(2)=1.5`
`H-underset(O)underset(||)C-H` (no resonance and double bond) B.O. of 'q'=2
`CH_(3)-OH` (no resonance and SINGLE bond) B.O. of 'r'=1
`.^(-)O-underset(O)underset(||)C-O^(-)harrO=underset(O^(-))underset(|)C-O^(-)=O` B.O. of 's' `=(2+1+1)/(3)=(4)/(3)=1.33`
Higher the bond order `rArr` Lesser the bond lenght
Bond lenght order `:qltpltsltr`
Discussion
8.

Correct order of b.p.t is /are:

Answer»

`H_(2)ltHe`
`H_(2)ltD_(2)`
`H_(2)OltD_(2)O`
`NH_(3)ltSbH_(3)`

ANSWER :B::C::D
Discussion
9.

Correctorderof B.Pof amineios

Answer»

`CH_(3) - NH_(2)gt (CH_(3))_(2) NH gt(CH_(3))_(3)N`
`(CH_(3))_(2)NH gt CH_(3) - NH_(2) gt (CH_(3))_(3)N`
`(CH_(3))_(3)Ngt(CH_(3))_(2) NH gt CH_(3) - NH_(2)`
`(CH_(3))_(2)NH gt (CH_(3))_(3) N gt CH_(3)- NH_(2)`

Answer :B
Discussion
10.

Correct order of BP is :-

Answer»

`H_(2)gtH_(2)O_(2)gtD_(2)OgtH_(2)OgtD_(2)`
`H_(2)O_(2)gtH_(2)gtD_(2)OgtH_(2)OgtD_(2)`
`H_(2)O_(2)gtD_(2)OgtH_(2)OgtD_(2)gtH_(2)`
`H_(2)O_(2)gtD_(2)OgtH_(2)gtH_(2)gtD_(2)`

Answer :C
Discussion
11.

Correct order of bond energy is :

Answer»

`N_2gtN_2^(+)gtN_2^(-)gtN_2^(2-)`
`N_2^(+)gtN_2^(-)gtN_2^(2-)gtN_2`
`N_2gtN_2^(-)=N_2^(+)gtN_2^(2-)`
`N_2^(-)gtN_2=N_2^(+)gtN_2^(2-)`

Solution :Bond order is directly PROPORTIONAL to the bond energy.
Bond order of `N_2=3, N_2^(+), N_2^(-)=2.5 " " N_2^(2-)=2`
But `N_2^(-)` has more ELECTRONS in antibonding MO's and THUS `N_2^(+)` is more stable than `N_2^-` .So correct order of bond energy will be `N_2 gt N_2^(+) gt N_2^(-) gt N_2^(2-)`
Therefore, (A) option is correct.
Discussion
12.

Correct order of bond angle is

Answer»

`(*CH_(3))gt(*CH_(3))`
`CH_(3)^(-)gtCH_(3)^(+)`
`CH_(4)gtCF_(4)`
`CH_(4)gt(*CH_(3))`

SOLUTION :in `(CF_(3))%` p-character because of which bond angle DECREASES.
Discussion
13.

Correct order of boiling points among following isCH_3(CH_2)_3CH_3 "X" C_2H_5OC_2H_5 ,"Y" CH_3 (CH_2)_3OH "Z"

Answer»

`X LT Y lt Z `
` Y GT X lt Z `
` Z lt X lt Y`
` Z gt X lt Y `

ANSWER :A
Discussion
14.

Correct order of boiling point is

Answer»

n-butane LT ETHOXYETHANE lt pentan-1-ol
n-butane ltpentan-1-olltethoxyethane
Ethoxyethane ltn-butane lt pentan-1-ol
Pentan-1-ol ltethoxyethane ltn-bulane

Answer :A
Discussion
15.

Correct order of basic strength of various amines given below : C_(6)H_(5)CH_(2)NH_(2)(A), C_(6)H_(5)NH_(2)(B),CH_(3)NH_(2)(C ), (CH_(3))_(2)NH(D)&(CH_(3))_(3)N(E)

Answer»

D GT C gt E gt B gt A
D gt E gt C gt A gt B
D gt C gt E gt A gt B
A gt C gt E gt D gt B

Answer :C
Discussion
16.

Correct order of acidity of I, II and IIImarked in following structure :

Answer»

I GT II gt III
I gt III gt II
II gt I gt III
II gt III gt I

Solution :N//A
Discussion
17.

Correct order of acidic strength of alcohols is :

Answer»

`R_3C-OH GT R_2CH—OH gt R—OH`
`R_2CH-OH gt R_3C—OH gt R—OH`
`ROH gt R_2CH—OH gtR_3C —OH`
`R_2CH-OH gt R—OH gt R_3C—OH`

ANSWER :C
Discussion
18.

Correct order of acidic strength for the given species

Answer»

`CH_(3)-C-=overset(o+)(N)-H`
`CH_(3)-CH_(2)-CH_(3)`
`CH_(3)-C-=C-H`

ANSWER :D
Discussion
19.

correct order of 1^@ , 2^@ and 3^@reactivity of and alcohols towards sodium metal is

Answer»

`1^@ GT 2^@ 3^@`
`1^@ gt 3^@ gt 2^@`
`3^@ gt 2^@ gt 1^@`
`2^@ gt 1^@ gt 3^@`

ANSWER :A
Discussion
20.

Correct order od dipole moment is :

Answer»


`PCl_(3)F_(2)gtPF_(3)Cl_(2)`
`CH_(3)FgtCH_(3)Cl`
`C_(3)O_(2)gtCOgtCO_(2)`

SOLUTION :
`mu_(1)`
`mu_("net")=sqrt(mu_(2)^(1)+mu_(1)^(2)+2mu_(1)^(2)cos 120^(@))=mu_(1)`
`mu=0`
(b) `PF_(3)Cl_(2)gtPCl_(3)F_(2)`
(C) `CH_(3)ClgtCH_(3)F`
(d) ` mu_(C_(3)O_(2))=mu_(CO_(2))=0`
`mu_(CO)~=0.1D`
Discussion
21.

Correct order is :-

Answer»

`MgO lt NIO lt K_(2) O ltCs_(2)O` (basic strength)
` Cs^(+)​ LTK^(​+)ltMg​_(2) ^(+) ​Be_(​2) ^(+) `​ (IONIC mobility in aqueous solution
`Li_(2) CO_(3)lt Na _(2) CO_(3)lt K_(2) CO_(3)`(solubility ORDER)
`NH_(3) lt PH_(3)lt AsH_(3) `(thermal stability)

Answer :C
Discussion
22.

Correct order for reaction with alcoholic KOH

Answer»

a gt b gt C gt d
a gt c gt b gt d
d gt b gt c gt a
a gt d gt b gt c

Answer :B
Discussion
23.

Correct order for N-O bond length in the given species is underset(I)(NO) underset(II) (NO^(+)) underset(III)(NO_(2)^(-)) underset(IV)(NO_(3)^(-))

Answer»

`I LT II lt III lt IV `
`II lt I lt III lt IV`
`II lt III lt IV lt I`
`I lt III lt IV lt II`

ANSWER :B
Discussion
24.

Correct option regarding the following chemical reaction : (State T for True and F for False) Cd(NO_(3))_(2)+KCN_("excess")to "Complex X" overset(H_(2)S)to ppt.'y' (P) Complex X is sp^(3) hybridised (Q) ppt. Y is yellow in colour (R) Complexes X is an example of imperfect complex (S) Complex X is a diamagnetic complex

Answer»

TTTT
TTTF
FTTF
FFTT

Solution :`X to K_(2)[CD(CN)_(4)], Y to CdS`
Discussion
25.

Correct option regarding above reaction is

Answer»

X is `CH_3-CH=C=O`
Y is
Both a and B
[4+2] CYCLO addition

Solution :
Discussion
26.

Correct matching from the codes given below

Answer»

a-2,b-4,c-5,d-1,e-3
a-5,b-4,c-1,d-3,e-2
a-1,b-3,c-4,d-2,e-5
a-4,b-5,c-2,d-1,e-3

Answer :A
Discussion
27.

Correct method to prepare Me_(3)C-O-Me in good yield is /are :

Answer»

`Me_(3)C-Cl+MeONararr`
`Me_(2)C=CH_(2)underset((II)SBH)overset((ii)HG(O Ac)_(2)+MeOH)rarr`
`Me_(3)C-O Na+MeClrarr`
`Me_(2)C=CH_(2)underset(MeOH)overset(H^(o+))rarr`

SOLUTION :
Discussion
28.

Correct match is :

Answer»

BAYER's method `- Na_(2)CO_(3)`
Matte `""-98% Cu_(2)S+2%FeS`
van Arkel method - AgI
Thomas slag - RAW material for cement industry

Solution :Roasted mass obtained from roasting step is CALLED matte. `(98% Cu_(2)S+2%FeS)`
Discussion
29.

Correct IUPAC name of the compound

Answer»

2-Ethyl-3-methylbutenedioicanhydride
3-Ethyl-2-methylbut-2-enedioicanhydride
2-Ethyl-3-Methyl-1,4-diketobut-2-enoicanhydride
2-Ethyl-3-methylcyclopentanoxy-1,4-dione

Solution :
Discussion
30.

Correct IUPAC name of the compound

Answer»

4-(ETHYL methanolyoxy )phenylpropanoate
Ethyl-4-propanoyloxybenzenecarboxylate
4-(1-Oxo-2-oxabutyl) phenylpropanoate
1-(1-Oxo-2-oxabutyl)-4-(1-oxopropoxy)benzene

Solution :
Discussion
31.

Correct IUPACname of following compound is

Answer»

2-AMINO-3-formylbutan -1,4-dioic ACID
2-formyl -3 -amino butane-1,4-dioic acid
3-amino-2-formylbutane-1,4-dioic acid
2-amino-3-carboxy-4-oxobutanoic acid

ANSWER :1
Discussion
32.

CorrectIUPACnameobtainedin thereactionof2- chloropropane+sodium anddryetheris :

Answer»

2,3 dimethybutane
2-isopropylpropane
N- HEXANE
NONE of these

ANSWER :A
Discussion
33.

Correct increasing order for the wavelengths of absorption in the visible regionfor the complexes of Co^(3+) is -

Answer»

`[CO(en)_(3)]^(3+), [Co(NH_(3))_(6)]^(3+) , [Co(H_(2)O)_(6)]^(3+)`
`[Co(H_(2)O)_(6)]^(3+) , [Co(en)_(3)]^(3+), [Co(NH_(3))_(6)]^(3+)`
`[Co(H_(2)O)_(6)]^(3+) , [Co(NH_(3))_(6)]^(3+) , [Co(en)_(3)]^(3+)`
`[Co(NH_(3))_(6)]^(3+) , [Co(en)_(3)]^(3+) , [Co(H_(2)O)_(6)]^(3+)`

ANSWER :A
Discussion
34.

Correct increasing order of stability

Answer»

IV,II,I,II
III,IV,I,II
II,IV,I,III
III,I,IV,II

Answer :D
Discussion
35.

Correct increasing order for the wavelength of absorption in the visible region for the complexes of Co^(3+)is

Answer»

`[CO(NH_3)_6]^(3+), [Co(en)_3]^(3+) , [Co(H_2O)_6]^(3+)`
`[Co(en)_3]^(3+), [Co(NH_3)_6]^(3+) , [Co(H_2O)_6]^(3+)`
`[Co(H_2O)_6]^(3+) , [Co(en)_3]^(3+), [Co(NH_3)_6]^(3+)`
`[Co(H_2O)_6]^(3+) , [Co(H_2O)_6]^(3+), [Co(en)_3]^(3+)`

ANSWER :B
Discussion
36.

Correct increasing order for the wavelength of absorption in the visible region for the complexes of Co^(3+) is

Answer»

`[Co(en)_(3)]^(3+), [Co(NH_(3))_(6)]^(3+), [Co(H_(2)O)_(6)]^(3+)`
`[Co(H_(2)O)_(6)]^(3+), [Co(en)_(3)]^(3+), [Co(NH_(3))_(6)]^(3+)`
`[Co(H_(2)O)_(6)]^(3+), [Co(NH_(3))_(6)]^(3+), [Co(en)_(3)]^(3+)`
`[Co(NH_(3))_(6)]^(3+), [Co(en)_(3)]^(3+), [Co(H_(2)O)_(6)]^(3+)`

Solution :From spectrochemical SERIES, the ABILITY to CAUSE crystal field splitting decreases in the order en `gt NH_(3) gt H_(2)O`. As CFSE is inversely proportional to wavelength of absorption in the visible region `(E=(hc)/(lambda))`, THEREFORE, the correct increasing order for the wavelength of absorption for `Co^(3+)` complexes is.
`[Co(en)_(3)]^(3+)lt[Co(NH_(3))_(6)]^(3+)lt[Co(H_(2)O)_(6)]^(3+)`
Discussion
37.

Correct formula of the complex formed in the brown ring test for NO_3^(-) is :

Answer»

`FeSO_4.NO`
`[FE(H_2O)_5 NO]^(2+)`
`[Fe(H_2O)_5NO]^(+) `
`[Fe(H_2O)_4 (NO_2)_2]`

Answer :B
Discussion
38.

Correct formula of patassium ferrocyanide is :

Answer»

`K_4[FE(CN)_6]`
`K_3[Fe(CN)_6]`
`KFE(CN)_6.H_2O`
Galena

Answer :A
Discussion
39.

Correct formula of patassium ferricyanide is :

Answer»

`K_4[Fe(CN)_6]`
`K_3[Fe(CN)_6]`
`KFE[Fe(CN)_6.H_2O]`
`K_2Fe[Fe(CN)_6]`

ANSWER :B
Discussion
40.

Correct formula of potassium ferricyanide is :

Answer»

`K_4[FE(CN)_6]`
`K_3[Fe(CN)_6]`
`KFE[Fe(CN)_6.H_2O]`
`K_2Fe[Fe(CN)_6]`

Answer :B
Discussion
41.

Correct formula of calomel is

Answer»

`Hg_(2)Cl_(2)`
`HgCl_(2)`
`HgCl_(2).H_(2)O`
`HgSO_(4)`

Answer :A
Discussion
42.

Correct expressions among the following are : (rho-density of solution, M molarity of solution, M_(2) Molar mass of solute, m-molarity, X_(2)-Mole fraction if solution )

Answer»

`m=(1000M)/(1000rho-MM_(2))`
`X_(2)=(mM_(1))/(1000+mM_(1))`
`X_(2)=(MM_(1))/(M(M_(1)-M_(2))+RHO)`
`m=(rho-MM_(2))/(M)`

Answer :A
Discussion
43.

Correct formula of aluminium nitride is

Answer»

ALN
`AlN_(2)`
`AlN_(3)`
`Al_(3)N_(2)`

ANSWER :A
Discussion
44.

Correct expression of "allred and Rochow's " scale is :

Answer»

ELECTRONEGATIVITY`=0.744(Z_(eff))/(R^(2))+0.359`
Electronegativity `=0.359(r^(2))/(Z_(eff))+0.744`
Electronegativity`=0.359(Z_(eff))/(r)+0.744`
Electronegativity=`0.359(Z_(eff))/(r^(2))+0.744`

SOLUTION :According to allred and rochow scale
(C) `EN_((AR))=0.359(Z_(eff))/(r)+0.744` (r: radius in Å)
Discussion
45.

Correct expression for elevation in boiling point is :

Answer»

`DELTA T_b =k_b m`
`Delta =K_f m`
`PI =CRT `
NONE of these.

SOLUTION :`Delta T_b =k_b m`
Discussion
46.

Correct equation of Freundich isotherm is

Answer»

`LOG((X)/(m))=LOGK+(1)/(n)log C`
`log((x)/(m))=logm+(1)/(m)log C`
`log((x)/(m))=logC+(1)/(K)log C`
`log((x)/(m))logC+(1)/(n)log K`

Solution :According to Freudlich isotherm`:(x)/(m)=KP^(1//n)`or `log.(x)/(m)=logK+(1)/(n)logP(` For solution,`P=C)`.
Discussion
47.

Correct decreasing order of volatility is

Answer»

`H_(2)O GT H_(2)S gt H_(2)SE`
`H_(2)S gt H_(2)O gt H_(2)Se`
`H_(2)Se gt H_(2)O gt H_(2)S`
`H_(2)S gt H_(2)Se gt H_(2)O`

ANSWER :D
Discussion
48.

Correct Decreasing order of pK_(b) value of Following Compound is

Answer»

`igtiigtiiigti`
`ivgtigtiiigtii`
`ivgtiiigtiigti`
`iigtiiigtigtiv`

ANSWER :B
Discussion
49.

Correct decreasing order of molecular forces of polymer is (i) Thermosetting(ii) fibres (iii) Thermoplastic (iv) elastomers

Answer»

`1gt2gt3gt4`
`2gt1gt3gt4`
`4gt3gt2gt1`
`2gt3gt1gt4`

ANSWER :B
Discussion
50.

Correct decreasing order of basic strength: Of following compound-

Answer»

`IIIgtIIgtI`
`IIgtIgtIII`
`IgtIIgtIII`
`IIIgtIgtII`

ANSWER :A
Discussion