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 one of the following the increase of presure favours the backward reaction?

Answer»

Formation of EQUILIBRIUM ammonia from `N_(2)(g) and H_(2)(g)`
Decomposition equilibrium of HI (g) to `H_(2)(g) and I_(2) (g)`
Synthesis of `SO_(3)` (g) by contact process
Production of 'syngas' by coal gasification

Solution :(a) `N_(2) (g) + 3 H_(2) (g) hArr 2 NH_(3) (g) , n_(p) LT n_(r)`
Hence, increases of pressure will favour forward reaction .
(b) `2 HI (g) hArr H_(2) (g) + I_(2), n_(p) = n_(r). `Hence , presure has no effect .
(c ) ` 2 SO_(2) (g) + O_(2) (g) hArr 2 SO_(3)(g), n_(p) ltn_(r).`
Hence , increases of pressure will favour forward reaction .
(d) `C(s)+ H_(2)O (g) hArr CO(g) + H_(2) (g) , n_(p) gt n_(r)` Hence, increase of pressure will favour BACKWARD reaction .
(e) `3Fe (s) + 4H_(2)O (g) hArr Fe_(3)O_(4) (s) + 4 H_(2) (g) , n_(p) = n_(r) . ` Hence , pressure has no erffect.
Discussion
2.

In which one of the following reactions, the yield of the products decreases by in creasing the pressure ?

Answer»

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

Answer :A::C
Discussion
3.

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

Answer»

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

Solution :`PCl_(5) = SP^(3)d , SF_(4) = sp^(3) d, I_(3)^(-) = sp^(3) d`.
`SbCl_(5)^(2-) = sp^(3) d^(2)`
Thus OPTION (d) is correct.
Discussion
4.

In which one of the following reactions, the yield of the product will be maximum ? 2 A + B hArr C, K = 10^(-5), C + 2 D hArr E, K = 10^(5) , D + 3 B hArr f, K = 10^(3).

Answer»

Solution :HIGHER the value of EQUILIBRIUM CONSTANT K, greater is the yield of PRODUCTS. HENCE, yield of E will be maximum.
Discussion
5.

In which one of the following reactions H_(2) is liberated?

Answer»

`NaH+H_(2)O to`
`NaCl+H_(2)O to`
`Na_(2)O+H_(2)O to `
`NaOH+H_(2)O to `

ANSWER :A
Discussion
6.

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 :In (b), `K^(+)` has 18 ELECTRONS in each. As they have same atomic number but DIFFERENT masses, so they are ALSO isotopes
Discussion
7.

In whichone of thefollowing pairsthe twospeciesare bothisoelectronic andisotopic (atomicnumberCa = 2 , Ar = 18 , K = 19 mg = 12 ,fe = 26 , Na=11 )

Answer»

`.^(40)Ca^(2+)` and `.^(40) Ar`
`.^(39) K^(+)` and `.^(40) K^(+)`
`.^(56) Fe^(3+)` and `.^(57) Fe^(2+)`
`.^(23)Na` and `.^(24) Na^(+)`

ANSWER :B
Discussion
8.

In which one of the following pairs of experimental observations and phenomemnon does the experimental observation correctly account for phenomenon does the experimental observation correctly account for phenomenon

Answer»

`{:("Experimental OBSERVATION","Phenomenon"),("X-ray SPECTRA","Charge on the nucleus"):}`
`{:("Experimental observation","Phenomenon"),(alpha"-PARTICLE scattering","Quantized electron orbit"):}`
`{:("Experimental observation","Phenomenon"),("Emission spectra","The quantization of energy "):}`
`{:("Experimental observation","Phenomenon"),("The photoelectric effect","The nuclear atom"):}`

Solution :Emission spectra of different `lambda` accounts for QUANTISATION of energy
Discussion
9.

Which one of the following bond is stronger ?

Answer»

`O_(2)`
`H_(2)`
`CO_(2)`
`N_(2)`

SOLUTION :`N-=N`
Discussion
10.

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

Answer»

0.0355 g
0.071 g
`6.023 XX 10^(21)` molecule
0.02 MOLE

Solution :(A) `0.0355 g Cl_(2) = (0.0355)/(71)` moles
(B) `0.71 g Cl_(2) = (0.71)/(71) =` mole `= 10^(-2)` mole
(C) `6.023 xx 10^(21)` MOLECULES `= (6.023 xx 10^(21))/(6.023 xx 10^(23)) = 0.01` mole
(D) 0.02 mole
Discussion
11.

In which one, alI the bonds are not equal ?

Answer»

`BF_(4)^(-)`
`NH_(4)^(+)`
`C_(2)H_(4)`
`SiCl_(4)`

SOLUTION :`C_(2)H_(4)`
Discussion
12.

In which one of the following cases mean free path increases

Answer»

Helium MOLECULES in a container are REPLACED by OXYGEN molecules 
Oxygen molecules in a container replaced by `CO_2` molecules 
`N_2` molecules in a container are replaced by Helium molecules 
Helium molecules in a container are replaced by nitrogen molecules 

Solution :`lambda darr` is size of molecules `uarr`.
Discussion
13.

In which of the followinng compounds the carbon marked with asterisk is expected to have greatest positive charge?

Answer»

`overset(***)(C)H_(3)-CH_(2)-Cl`
`overset(***)(C)H_(3)-CH_(2)-MG^(+)Cl^(-)`
`overset(***)(C)H_(3)-CH_(2)-Br`
`overset(***)(C)H_(3)-CH_(2)-CH_(3)`

Solution :As Cl is most electronegative element among Cl, M, Br and C THUS, it has GREATER -I effect and the ASTERISK marked carbon in `.^(***)CH_(3)-CH_(2)-Cl` is expected to have greater POSITIVE charge.
Discussion
14.

In which of the followinng functional group isomerism is not possible?

Answer»

ALCOHOLS
Aldehdyes
Alkyl HALIDES
Cyanides

Solution :In alkyl halides, functional GROUP isomerism is not POSSIBLE. Alcohols and ehters, aldehydes and KETONES, cyanides and isocyanides are functional group isomers.
Discussion
15.

In which of the following Tyndall effect is not observed?

Answer»

Suspensions
Emulsions
Sugar solution
Gold sol.

Answer :C
Discussion
16.

In which of the following, the solubility of AgCl will be maximum?

Answer»

`0.1 M AgNO_3`
water
`0.1 M NACL`
` 1 M NaCl`

SOLUTION :DUE to common-ioneffect , solubilityof AGCL decreases,
Discussion
17.

In whichof the followingtheratioof thesizesof cation toanionis smallest?

Answer»

`NACL`
`KCI`
`MgCl_(2)`
`CaF_(2)`

ANSWER :C
Discussion
18.

In which of the following the positive electromaric effect is present?

Answer»




ANSWER :B
Discussion
19.

In which of the following the oxidation state of chlorine is +5?

Answer»

`HClO_(4)`
`HClO_(3)`
`HClO_(2)`
HCl

Answer :B::C
Discussion
20.

In which of the following the metal is getting oxidised ?

Answer»

`CuO_((s))+H_(2(G))rarrCu_((s))+H_(2)O_((g))`
`2FeCl_(3(aq))+H_(2(g))rarr 2FeCl_(2(aq))+2HCl_((aq))`
`2K_((s))+F_(2(g))rarr2KF_((s))`
`Fe_(2)O_(3(s))+3CO_((g))rarr2Fe_((s))+3CO_(2(g))`

Answer :C
Discussion
21.

In which of the following compounds is hydrogen bonding strongest in liquid phase ?

Answer»

HF
`CH_(4)`
`HI`
`PH_(3)`

Answer :A
Discussion
22.

In which of the following , the hydrogen bonding is strongest in the liguid phase?

Answer»

`HF`
`CH_(4)`
`HI`
`PH_(3)`

Answer :A
Discussion
23.

In which of the following the hybridisation of carbon is more than one?

Answer»

`CH_(3)CH_(2)CH_(2)CH= CHCH_(3)`
`HC -= C - C -= CH`
`CH_(2)= CH- CH= CH_(2)`
`CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CH_(3)`

ANSWER :A
Discussion
24.

In which of the following the hybrid orbitals of the central atom have the same s-character-

Answer»

`CH_(4)`
`NI(CO)_(4)`
`XeO_(3)`
`[Ni(CN)_(4)]^(2-)`

ANSWER :A::B::D
Discussion
25.

In which of the following, the group attached to the benzene ring shows + R effect ?

Answer»




All the these

SOLUTION :N/A
Discussion
26.

Inwhich of the following , the double bond consists of both pi bonds

Answer»

`O_(2)`
`C_(2)`
`Be_(2)`
`S_(2)`.

ANSWER :B
Discussion
27.

In which of the following the central atom has two lone pairs of electrons ?

Answer»

`SF_(4)`
`BrF_(5)`
`SO_(2)`
`XeF_(4)`

Solution :
Discussion
28.

In whichof the following the central atom is not in the sp^(3) hybridised state?

Answer»

BORON in solid layered BORIC ACID
Boron in diboare
Boron in the product formed by the reaction of sodium HYDRIDE with diborane
Boron in the product formed by the ADDITION of `(CH_(3))_(3) N` to diborane.

Answer :A
Discussion
29.

In which of the following the central atom does not usesp^(3) - hydrid orbitals in its bonding.

Answer»

`BeF_(3)^(-)`
`OH_(3)^(-)`
`NH_(2)^(-)`
`NH_(3)`

Solution :` Be F_(3)^(-) = Be F_(2) + F^(-). Be F_(2)` INVOLVES sp HYBRIDISATION .
Discussion
30.

In which of the following the C - O bonds are equal length

Answer»

`CH_(3) COO^(-)`
`CH_(3)COOH`
`CH_(3)COOH_(3)`
In all

Solution :ACETATE ion has two equivalent resonating structures, others have non-equivalent resonating STRUCTURE
Discussion
31.

In which of the following the bond energy between carbon atoms is highest

Answer»

`CH_(3)-CH_(3)`
`CH_(2)=CH_(2)`
`CH-=CH`
`CH_(3)-CH_(2)-CH_(3)`

SOLUTION :Bond ORDER is DIRECTLY proportional to bond energy.
Discussion
32.

In which of the following systems the dispersed phase and dispersion medium are both solid

Answer»

Foam
Dust strom
Coloured glass
Paints

Answer :C
Discussion
33.

In which of the following substrates, rate of Benzoin condensation will be maximum?

Answer»




Solution :
Benzoin condensation is due to STABILITY of intermediate (III) when negative charge on C is extensively delocalised in benzenne ring , NITRO and -`C^(@)` N group. INALL other cases, such dispersal is nor extensively possible . On theother hand, `NO_(2)-`is also creating a positive charge center on CARBONYL carbon, making it more susceptible to nucleophilic attack of `CN^(-)`.
Discussion
34.

In which of the following substance will hydrogen bond be strongest ?

Answer»

HCL
`H_(2) O `
HI
`H_(2) S`

SOLUTION :HCl, HI and ` H_(2)S` do not FORM H-form H-bonds. Only `H_(2)O` forms H-bonds .
Discussion
35.

In which of the following substances will hydrogen bond be strongest ?

Answer»

HCI
`H_(2)`O
HI
`H_(2)`S

Solution :`H_(2)`O
In HCI, HJ and `H_(2)`S do not FORM H-BONDS.
But `H_(2)O` forms hydrogen bonds. On `H_(2) O ` molecule forms FOUR H-bonding .
Discussion
36.

In which of the following substance, hydrogen bonding is absent ?

Answer»

HF
`H_2O`
`C Cl_4`
Salicylaldehyde

Solution :Carbon cannot FORM H - BOND.
Discussion
37.

In which of the following structures coordination number for cations and anions in the packed structure will be same ?

Answer»

`Cl^(-)` ion from fcc LATTICE and `Na^(+)` ions occupy all octahedral voids of the unit CELL.
`CA^(2+)` ions from fcc lattic and ` F^(-)`ions occupy all the eight tetrahedral voidsof the unit cell.
`O^(2-)` ions from fcc lattice and ` Na^(+)` ions occupy all the eight tetrahdral voids of the unit cell.
`S^(2-)` ions from fcc lattice and ` Zn^(2+)` ions go into ALTERNATE tetrahedral voids of the unit cell.

Solution :In ` Na^(+)Cl^(-)` , all cations and anions have a coordination NUMBER of 6.
Discussion
38.

In which of the following states, the particle size would be greater than 300 m mu

Answer»

Suspension
True solutions
Colloidal solution
None of the above.

Solution :SUSPENSIONS.
Discussion
39.

In which of the following states of matter the average distance between the molecules lies between 10^(-5) cm " to " 10^(-7) cm?

Answer»

solide
liquid
gas
None of these

Solution :The AVERAGE DISTANCE between the MOLECULES in liquid is between `10^(-5)` CM to `10^(-7) cm`
Discussion
40.

In which of the following species the inter atomic bond angle is 109^(@).28?

Answer»

`NH_(3)(BF_(3))`
`(NH_(4))^(+)(BF_(3))`
`NH_(3)(BF_(4))^(-)`
`(NH_(2))^(-)(BF_(3))`

Answer :A
Discussion
41.

In which of the following species the inter atomic bond angle is 109^@ .28?

Answer»

`NH_3 (BF_3)`
`(NH_4)^+ (BF_3)`
`NH_3 (BF_4)^(-)`
`(NH_2)^(-) (BF_3)`

ANSWER :A
Discussion
42.

In which of the following species is the underlined carbon having sp^3hybridisation ?

Answer»

`CH_(3)ul(C )OOH`
`CH_(3)ul(C )H_(2)OH`
`CH_(3)ul(C )OCH_(3)`
`CH_(2)=ul(C )H-CH_(3)`

Solution :`CH_(3)-overset(Sp^(3))(CH_(2))-OH`
Discussion
43.

In which of the following species hyperconjugation in possible?

Answer»

`CH_(3)-overset(-)(C)H_(2)`
`C_(6)H_(5)-CH_(3)`
`CH_(2)=CH_(2)`
`CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH=CH_(2)`

SOLUTION :For HYPERCONJUGATION `alpha`-carbon with RESPECT to `sp^(2)` hybridised carbon should have at LEAST one hydrogen.
Discussion
44.

In which of the following solvents should KCI be soluble at 25^@ C ?(D = Dielectric constant value)

Answer»

`C_(6)H_(6)[D=0]`
`CH_(3)COCH(_3)[D=2]`
`"CC"l_(4)[D=0]`
`CH_(3)OH[D=32]`

Answer :D
Discussion
45.

In which of the following solvents should KCl be soluble at 25^(@)C ? (D=Dielectric constnat value)

Answer»

`C_(6)H_(6)[D=0]`
`CH_(6)COCH_(3)[D=2]`
`"CC"I_(4)[D=0]`
`CH_(3)OH[D=32]`

Answer :D
Discussion
46.

In which of the following solvents is silver chloride most soluble ?

Answer»

`0.1"mol dm"^(-3)AgNO_(3)" SOLUTION"`
`0.1" mol dm"^(-3)HCl" solution"`
`H_(2)O`
Aqueous ammonia

Solution :`AGCL+2NH_(3)tounderset("(Soluble)")([AG(NH_(3))_(2)])Cl`
Thus, AgCl is most soluble in aqueous ammonia.
Discussion
47.

In which of the following solvent soap will act as colloid ?

Answer»

WATER
ALCOHOL
Ether
Ester

Answer :A
Discussion
48.

In which of the following solvent is silver chloride most soluble ?

Answer»

0.1 mol `dm^(-3) AgNO_(3)` SOLUTION
0.1 mol `dm^(-3)` HCl solution
`H_(2)O`
Aqueous ammonia

Solution :AGCL will be most soluble in aqueous ammonia because it forms a COMPLEX, `[Ag(NH_(3))_(2)]^(+)Cl^(-)`.
Discussion
49.

In Which of the following situations the heavier of the two particles have smaller de Broglie wavelength ? The two particles

Answer»

MOVE with same speed
move with same linear MOMENTUM
move with same KINETIC energy
have fallen from same HEIGHT

SOLUTION :`lambda alpha(1)/(mv)`
Discussion
50.

In which of the following sets, elements have nearly same atomic radii?

Answer»

Li, Be, B
MG, CA, SR
FE, Co, Ni
O, S, Se

Answer :C
Discussion