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.

The correct order of electron gain enthalpy with negative sign of F.Cl.Br and I, having atomic 9,17,35, and 53 respectively, is :

Answer»

`IgtBrgtClgtF`
`FgtClgtBrgtI`
`ClgtFgtBrgtI`
`BrgtClgtIgtF`

ANSWER :C
Discussion
2.

The correctorder of electronegativitiesof N, O , Fand P is

Answer»

`F gt N gt P gt O`
`F gt O gt P gt N`
`F gt O gt N gt P `
`N gt O gt F gt P`

SOLUTION :Electronegativity (EN)increasesalong aperiodthereforeEN of N, O ,Fdecreases in the ORDER: `F gt O gt N` FurtherENdecreasesdown a GROUP , thereforeEN of `N gt P`. Thereforethe overall ENOF thefouratomsdecrease in the order `: F gt O gt N gt P.`
Discussion
3.

The correct order of electron gain enthalpy with negative sign of F, CI, Br and I having atomic number 9, 17, 35 and 53, respectively is .............

Answer»

`I GT BR gt CL gt F`
`F gt Cl gt Br gt I`
`Cl gt F gt Br gt I`
`Br gt I gt Cl gt F`

SOLUTION :`Cl gt F gt Br gt I`
Discussion
4.

The correctorder ofelectron gain enthalpywithnegativesign of F, C1 , Br andI , havingatomicnumber 9, 17, 35 and 53 respectivelyis

Answer»

`I GT BR gt C1 gt F`
`F gt C1 gt Br gt I`
`C1 gt F gt Br gt I`
`Br gt C1 gt I gt F`

Solution :Due tosmallersize `Delta_(EG) H_(1)` F is lowerthan thatof C1 .
Thuscorrectorder ofelectrongain enthalpy(in kJ `mol^(-1))`with negativesigh followsthe ORDER:
`C1 (-349 ) gt F (-328) gt Br (-325) gt (- 295)` i.e.,option ( c ) ISCORRECT.
Discussion
5.

The correct order of electron gain enthalphy with negative sigh of F, Cl , Br and I having atomic number 9,17 ,35 and 53 respectively is

Answer»

`IgtBrgtCIF`
`FgtCIgtBrgtI`
`CIgtFgtBrgtl`
`BrgtIgtCIgtF`

ANSWER :C
Discussion
6.

The correct order of electron affinity of the elements of oxygen family in the periodic table is

Answer»

O GT S gt SE 
S gt O gt Se
S gt Se gt O`
Se gt O gt S 

ANSWER :C
Discussion
7.

The correct order of dielectric constant values

Answer»

`H_2O GT D_2O gt H_2O_2`
`H_2O gt H_2O_2 gt D_2O`
`H_2O LT D_2O lt H_2O_2`
`H_2O_2 lt H_2O lt D_2O`

SOLUTION :`H_2O gt D_2O gt H_2O_2`
Discussion
8.

The correct order of decreasing second ionisation energy of Li, Be, Ne,C,B

Answer»

`Ne GT B gt LI gt C gt Be`
`Li gt Ne gt C gt B gt Be`
`Ne gt C gt B gt Be gt Li`
`Li gt Ne gt B gt C gt Be`

Answer :D
Discussion
9.

The correct order of decreasing second ionization enthalpy of Ti(22), V(23), Cr (24) and Mn(25) is

Answer»

`Cr lt MN GT VGT Ti `
`V gt Mn gt Cr gt Ti`
`Cr gt Mn gt V gt Ti `
`Ti gt V gt Cr gt Mn `

Answer :C
Discussion
10.

The correctorderof decreasingionicradiiamongthe followingisoelectronicspeciesis

Answer»

`K^(+) LTCA^(2+) gt C1^(-) gt S^(2-)`
`Ca^(2+)gt K^(+) gt S^(2-)gt C1^(-)`
`C1^(-) gt S^(2-)gt Ca^(2+)gt K^(+)`
`S^(2-)gt C1^(-)gt K^(+)gt Ca^(2+)`

Solution :Amongisoelectronic ions , IONICRADII decreasesasthe magnitude of - vechargedecreasesor themagnitudeof + vechargeincreases. Thusionicradiidecreasesin the ORDER ,i.e.,`S^(2-)gt C1^(-)gt K^(+) gt Ca^(2+)` i.e.,OPTION(d) is CORRECT.
Discussion
11.

The correct order of decreasing ionic radii among the following isoelectronic species is

Answer»

`CA^(+2) GT K^(+) gt S^(-2) gtCl^(-)`
`CI^(-) gtS^(-2)gt Ca^(+2) gt K^(+)`
`S^(-2) gt CL^(-) gt K^(+) gt Ca^(+2)`
`K^(+) gt Ca^(+2) gt Cl ^(-) gt s^(-2)`

Answer :C
Discussion
12.

The correct order of decreasing H-C-H angle in the following molecule is:

Answer»

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

ANSWER :B
Discussion
13.

The correct order of decreasing first ionisation energy is.....

Answer»

`C GT B gt Be gt LI`
`C gt Be gt B gt Li`
`Be gt C gt B gt Li`
`Be gt Li gt B gt C`

ANSWER :b
Discussion
14.

The correct order of decreasing electronegativity values among the elements X,Y,Z and A with atomic numbers 4,8,7 and 12 respectively

Answer»


ANSWER :a
Discussion
15.

The correct order of decreasing acidic nature of H_(2)O, ROH, CH -= CH and NH_(3)is

Answer»

`CH-=Ch gt H_(2) O gt ROH gt NH_(3)`
`H_(2)O gt ROH gt CH -= CH gt NH_(3)`
`ROH gt NH_(3) gt CH -= CH gt H_(2)O`
`H_(2)O gt rOH gt NH_(3) gt CH -= CH`

SOLUTION :`{:(,H_(2)O,ROH,CH-=CH,NH_(3),),(pK_(a),15.7,16-18,""26,38,):}`
Smaller the `pK_(a)` value, stonger is the ACID. Hence, decreasing order of acidic NATURE is
`H_(2)O gt ROH gt CH-=CH gt NH_(3)`.
Discussion
16.

The correct order of C - 0 bond length among CO , CO_(3)^(2-)and CO_(2) is

Answer»

`CO lt CO_(3)^(2-) lt CO_(2)`
`CO_(3)^(2-) lt CO_(2) lt CO`
`CO lt CO_(2) lt CO_(3)^(2-)`
`CO_(2) lt CO_(3)^(2-) lt CO`

Solution :`CO lt CO_(2) lt CO_(3)^(2-)`
All these structures exhibits RESONANCE and can be represented by the FOLLOWING resonating structures
More is the single bond character. More will be the bond length. HENCE, the correct order is :
CO`lt CO_(2) lt CO_(3)^(2-)`
Discussion
17.

The correct orderof bond order values among the following : A . NO^(-) B.NO^(+) C.NOD.NO^(2+) E. NO^(2-) is

Answer»

`A lt D lt C lt B lt E`
`D = B lt A lt E LE C `
`E lt A lt D = C lt B`
`B lt C lt D lt A lt E `

SOLUTION : `NO=KK sigma_(2)^(2) sigma_(2s)^(**2) sigma_(2p_(Z))^(2) pi_(2p_(x))^(2)pi_(2p_(y))^(2)pi_(2p_(x))^(**1)`
B.O. `= (1)/(2) (8-3) = (5)/(2) = 2.5 `
`NO^(-)=KK sigma_(2)^(2) sigma_(2s)^(**2) sigma_(2p_(z))^(2) pi_(2p_(x))^(2)pi_(2p_(y))^(2)pi_(2p_(x))^(**1)pi_(2p_(y))^(**1)`
B.O. = `(1)/(2) (8-4)= 2`
`NO^(2-)=KK sigma_(2)^(2) sigma_(2s)^(**2) sigma_(2p_(z))^(2) pi_(2p_(x))^(2)pi_(2p_(y))^(2)pi_(2p_(x))^(**2)pi_(2p_(y))^(**1)`
B.O. = `(1)/(2) (8-5) = (3)/(2) = 1.5 `
`NO^(+)=KK sigma_(2)^(2) sigma_(2s)^(**2) sigma_(2p_(z))^(2) pi_(2p_(x))^(2)pi_(2p_(x))^(2)pi_(2p_(y))^(2)`
B.O. `= (1)/(2) (8-2) = 3 `
`NO^(2+)=KK sigma_(2)^(2) sigma_(2s)^(**2) sigma_(2p_(z))^(2) pi_(2p_(x))^(2)pi_(2p_(y))^(1)`
B.O. ` = (1)/(2) (7-2) = (5)/(2) = 2.5 `
THUS `NO^(2-) lt NO^(-) NO = NO^(2-) lt NO^(+)`,
i.e. `E lt A lt C = D lt B `
Discussion
18.

The correct order of bond lengths is

Answer»

`H-CI gtH-BR gtH-I`
`H-I gtH - Br gtH - CI`
`H-I GT H-CI gtH-Br`
`H-Br gtH-I gt H-CI`

Answer :B
Discussion
19.

The correct order of Boiling points is

Answer»

`H_2Ogt H_2O_2 gt D_2O`
`D_2O gt H_2O gt H_2O_2`
`H_2O_2 gt H_2O gt D_2O`
`H_2O_2 gt D_2O gt H_2O`

Solution :The CORRECT ORDER of BOILING points is
`H_2O_2 gt D_2O gt H_2O`
Discussion
20.

The correct order of boiling point of 2,2-dimethyl-propane , 2-methylbutane and n-pentane is

Answer»

n-pentane GT 2,2-dimethylpropane gt 2-methyl-butane
n-pentane gt 2-methylbutane gt 2,2-dimethyl-propane
2-methylbutane gt n-pentane gt 2,2-dimethyl-propane
2-methylbutane gt 2 ,2-dimethylpropane gt n-pentane

Solution :BOILING point DECREASES as BRANCHING increases, i.e., n-pentane gt 2-methylbutane gt 2,2-dimethyl-propane
Discussion
21.

The correct order of boiling point order for corresponding hydrocarbons is :

Answer»

`"alkyne"gt"ALKANE" gt"ALKENE"`
`"alkane"gt"alkene" gt"alkyne"`
`"alkyne" gt "alkene "gt "alkane"`
`"alkene"gt"alkyne" gt"alkane"`

Answer :C
Discussion
22.

The correct order of boiling point for primary (1^(@)), secondary (2^(@)) and tertiary (3^(@)) alcohols is

Answer»

`1^(@) gt 2^(@) gt 3^(@)`
`3^(@) gt 2^(@) gt 1^(@)`
`2^(@) gt 1^(@) gt 3^(@)`
`2^(@) gt 3^(@) gt 1^(@)`

Solution :Alcohols with same mol. Wt are EXPECTED to have almost same b.p., HOWEVER, TWO more FACTORS other than mol. wt. are important, they are namely H-bonding and surface area of molecule. Both these factors are least in `3^(@)` alchols and maximum in `1^(@)` alcohols. Hence `3^(@)` alcohols have least b.p. while `1^(@)` alcoholshave maximum b.p.
Discussion
23.

The correct order of basicity of the following species is

Answer»

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

ANSWER :B
Discussion
24.

The correct order of atomic radii is....

Answer»

`NA lt MG lt Al lt SI`
`Si lt Al lt Mg lt Na`
`Na lt Al lt Si lt Mg`
`Al lt Si lt Mg lt Na`

Answer :B
Discussion
25.

The correct order of atomic radius of Li, Be and B is

Answer»

B GT Be gt LI 
B gt Li gt Be
Li gt B gt Be 
Li gt Be gt B 

ANSWER :D
Discussion
26.

The correct order of atomic radii is:

Answer»

EugtCegtHogtN
NgtCegtEugtHo
CegtEugtHogtN
HogtNgtEugtCe

Answer :A
Discussion
27.

The correct order of atomicradiiin group 13elements is

Answer»

`B LT Al lt INLT GA lt TL`
`B lt Al lt Ga lt In lt Tl`
`B lt Ga lt Al lt Tl lt In`
`B lt Ga lt Al lt In lt Tl`

Answer :D
Discussion
28.

The correct order of atomic radii in group 13 elements is

Answer»

B LT GA lt Al lt In lt TI
B lt Al lt In lt Ga lt TI
B lt Ga lt Al lt Ti lt In
B lt Al lt Ga lt In lt TI

Solution :
Discussion
29.

The correct order of atom orbitals in terms of energy between 8s and 8 p ordital are .

Answer»

7D,6f
5G,6f, 7d
6d, 7f
4h, 5g, 6f, 7d

Solution :`8srarr8+0=8`
`8P RARR 8+1=9`
` 5g rarr 5+4=9`
`6f rarr 6+3=9`
` 7d rarr 7+2=9`
CORRECT order `rarr 8s 5g 6f 7d 8p`
Discussion
30.

The correct order of acidity of the C-H proton is-

Answer»

ACETYLENE `GT` ETHYLENE `gt` ETHANE
ethylene `gt` ethylene `gt` ethane
ethane `gt` ethylene `gt` acetylene
acetylene `gt` ethane `gt` ethylene

Answer :A
Discussion
31.

The correct order of acidity for the following is

Answer»

`HCN gt ClCH_(2)CO OH gt HCO OH gt CH_(3)CO OH`
`HCN gt HCO ON gt ClCH_(2)CO ON gt CH_(3)CO OH`
`ClCH_(2)CO OH gt HCO OH gt CH_(3) CH_(3) CO OH gt HCN`
`ClCH_(2)CO OH gt HCN gt HCO OH gt CH_(3)CO OH`

ANSWER :C
Discussion
32.

The correct order of acid strength of the following substituted phenols in water at 28^(@)C is

Answer»

p-nitrophenols `LT` p-fluorophenol `lt` p-chlorophenol
p-chlorophenol `lt` p-fluorophenol `lt` p-nitrophenol
p-fluorophenol `lt` p-chlorophenol `lt` p-nitrophenol
p-fluorophenol `lt` p-nitrophenol `lt` p-chlorophenol

Solution :`-I` EFFECT of F is more than `CL`.
Discussion
33.

The correct order of acid strength of the following compounds:

Answer»

Phenol
p-Cresol
m-Nitrophenol
p-Nitrophenol

Answer :A
Discussion
34.

The correct order in which the O-O bond length increases in the respectively are

Answer»

`O_(3) lt H_(2)O_(2) lt O_(2)`
`O_(2) lt O_(3) lt H_(2)O_(2)`
`O_(2) lt H_(2)O_(2) lt O_(3)`
`H_(2)O_(2) lt O_(2) lt O_(3)`

Solution :Bond length INCREASES as bond ORDER )within bracketts decreases, i.e.,
`O_(2)(2) lt O_(3)(1.5) lt H_(2)O_(2) (1)`
Discussion
35.

The correct order in which O-O bond length increases in the following is

Answer»

`O_(3) lt H_(2) O_(2) lt O_(2)`
`O_(2) ltO_(3) lt H_(2) O_(2)`
`O_(2) lt H_(2) O_(2) lt O_(3)`
`H_(2) O_(2) lt O_(2) lt O_(3)`

Solution :BOND orders of O-O are :` O_(3) (1.5), H_(2) O_(2)` (1),
`O_(2)(2)` . GREATER the bond order, SHORTER is the bond length .
Discussion
36.

The correct order for homolytic bond dissociation energis (Delta H in kcal/mol) for CH_(4)(A), C_(2)H_(6)(B) and CH_(3)Br(C ) is….

Answer»

`C GT B gt A`
`B gt C gt A`
`C gt A gt B`
`A gt B gt C`

ANSWER :B
Discussion
37.

The correct options (s) to distinguish nitrate salts of Mn^(2+) and Cu^(2+) taken separately is (are)

Answer»

`Mn^(2+)` show the CHARACTERISTIC GREEN colour in the flame test
only `Cu^(2+)` show the formation of precipitate by PASSING `H_(2)S` in acidic medium
Only `Mn^(2+)` show the formation of precipitate by passing `H_(2)S` in faintly basic medium
`Cu^(2+)//Cu` has higher reduction potential than `Mn^(2+)//Mn` (measured under similar conditions)

Solution :only `Cu^(2+)` ions can give a precipitate (black) by passing `H_(2)S` GAS in the acidic medium.
`E^(@) Cu^(2)//Cu (+0.34V)` is higher than `E^(@)Mn^(2+)//Mn (-1.18V)` in the electrochemical series.
Discussion
38.

The correct of increasing bond angles in the following species is

Answer»

`CIO_(2)^(-) lt Cl_(2)O lt ClO_(2)`
`Cl_(2)O lt ClO_(2) lt ClO_(2)^(-)`
`ClO_(2) lt Cl_(2)O lt ClO_(2)^(-)`
`Cl_(2)O lt ClO_(2)^(-) lt ClO_(2)`

Solution :
In `ClO_(2), Cl is sp^(2)` -hybridized and the bond ANGLE
is `180^(@)` . In `Cl_(2)O,OIS sp^(3)` -hybridized . HOWEVER ,
dueto repulsions between two BIG sized Cl atoms,
the bond angle increases from `109.5^(@)` to `111^(@)` . In
`ClO_(2)^(-) ,Cl` ATOM is `sp^(3)`-hybridizedbut due to
lp-bp repulsions, the angle decreases from `109.5^(@)`
to `103^(@)` .Thus, the increasing order of bond angles
is `ClO_(2)^(-) lt Cl_(2)O lt ClO_(2)`.
Discussion
39.

The order of decrease in atomic radii for Be, Na and Mg is

Answer»

`Be gt Mg gt NA`
`Na GTMG gt Be`
`Mg gt Na gt Be`
`Mg gt Be gt Na`

ANSWER :B
Discussion
40.

The correct name of the product obtained is

Answer»

cis-1,2-dibromocyclohexane
cis-1,4-dibromocyclohexane
trans-1,2-dibromocyclohexane
trans-1,4-dibromocyclohexane

Answer :C
Discussion
41.

The correct name of CH_(3)CH_(2)-underset(O)underset(||)(C)-underset(CN)underset(|)(C)H-CHO is

Answer»

2-cyano-3-oxopentanal
2-formyl-3-oxopentanenitrile
2-cyano-1,3-pentadiene
1,3-dioxo-2-cyanopentane

Solution :`underset("2-Formyl-3-oxopentanenitrile")(overset(5)(C)H_(3)-overset(4)(C)H_(2)-underset(O)underset(||)overset(3)(C)-underset(._(1)CN)underset(|)overset(2)(C)H-overset(O)overset(||)(C)-H)`
Discussion
42.

The correct match of contents in column-I with those in column-II is .......

Answer»

`1 -C, 2-a, 3-B, 4-d`
`1-d, 2-a, 3-b, 4-c`
`1-b, 2-d, 3-a, 4-c`
`1-a, 2-b, 3-c, 4-d`

ANSWER :b
Discussion
43.

The correct match is

Answer»

`{:(A,B,C,D),(2,5,4,1):}`
`{:(A,B,C,D),(5,2,3,1):}`
`{:(A,B,C,D),(2,4,5,1):}`
`{:(A,B,C,D),(1,2,3,4):}`

ANSWER :A
Discussion
44.

The correct match is

Answer»

`{:(A,B,C,D),(2,1,3,4):}`
`{:(A,B,C,D),(4,3,1,5):}`
`{:(A,B,C,D),(1,3,5,4):}`
`{:(A,B,C,D),(4,2,1,5):}`

ANSWER :B
Discussion
45.

The correct match is

Answer»

`{:(A,B,C,D),(1,5,3,2):}`
`{:(A,B,C,D),(5,3,4,1):}`
`{:(A,B,C,D),(3,1,2,5):}`
`{:(A,B,C,D),(3,1,5,3):}`

ANSWER :C
Discussion
46.

The correct match is

Answer»

`{:(A,B,C,D),(4,2,3,1):}`
`{:(A,B,C,D),(2,3,4,1):}`
`{:(A,B,C,D),(3,4,2,1):}`
`{:(A,B,C,D),(4,3,2,1):}`

ANSWER :D
Discussion
47.

The correct match is

Answer»

`{:(A,B,C,D),(4,5,1,2):}`
`{:(A,B,C,D),(2,3,4,5):}`
`{:(A,B,C,D),(5,4,1,2):}`
`{:(A,B,C,D),(1,4,2,3):}`

ANSWER :C
Discussion
48.

The correct match is

Answer»

`{:(A,B,C),(2,1,3):}`
`{:(A,B,C),(3,1,2):}`
`{:(A,B,C),(1,2,3):}`
`{:(A,B,C),(3,2,1):}`

Solution :Water freezes spontaneously at `-10^(@)C`
`rArr Delta G LT 0`
It is at EQUILIBRIUM with ICE at `0^(@)C rArr Delta G = 0` at `T gt 10^(@)C`, it doesnot freeze `rArr Delta G = 0`
Discussion
49.

The correct match is

Answer»

`{:(A,B,C,D),(1,2,3,4):}`
`{:(A,B,C,D),(4,3,2,1):}`
`{:(A,B,C,D),(3,4,1,3):}`
`{:(A,B,C,D),(3,2,1,4):}`

SOLUTION :`HNO_(3) + KOH"& " HCl "& " NaOH` is
SA + SB = `-57.3`
`CH_(3)COOH + NaOH` is WA + SB
`CH_(3)COOH + NH_(4)OH` is WA `+ SB RARR` least
Discussion
50.

The correct match is

Answer»

`{:(A,B,C,D),(4,1,2,3):}`
`{:(A,B,C,D),(1,2,3,4):}`
`{:(A,B,C,D),(4,3,2,1):}`
`{:(A,B,C,D),(4,3,1,2):}`

SOLUTION :W is a path FUNCTION
H is extensive and a STATE variable
T is intensive
Discussion