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.

Isobutyl bromide may be obtained from isobutylene and HBr in the presence of ________.

Answer»

peroxide
hydroquinone
pyridine
diffused sunlight

Answer :A
Discussion
2.

Isobutyl alcohol cannot be obtained by the reaction between :

Answer»

`C_(2)H_(5)MgBr` and `CH_(3)CHO`
`CH_(3)MgBr` and `CH_(3)CH_(2)CHO`
`(CH_(3))_(2)CHMgBr` and `HCHO`
`CH_(3)MgBr` and `CH_(3)COCH_(3)`

ANSWER :A,B,D
Discussion
3.

Isobutene overset(HBr)underset("peroxide")rarrAoverset(KCN)rarrBoverset(dil. H_2SO_4)rarrC+ inorganic salt D C and D are

Answer»

`Me_2CHCH_2COOH,(NH_4)_2SO_4`
`Me_2CHCOOH,(NH_4)_2SO_4`
`Me_2CHCH_2COOK,NH_4OH`
`Me_2CHCH_2COOK,K_2SO_4`

SOLUTION :
Discussion
4.

Karl Ziegler reported that alkenes react with N-bromosuccinimide (NBS) in presence of light to give products resulting from substitution of hydrogen by bromine at the allylic position i.e., the position next to the double bond. Let us consider the halogenation of cyclohexane. Energy level diagram for allylic vinylic and alkylic free redicals is given below: Which of the following sequences is correct about C-H bond energy ?

Answer»

(C-H)VINYLIC`GT`(C-H) Alkylic `gt` (C-H) ALLYLIC
(C-H) Vinuylic `LT`(C-H) Alkylic `lt` (C-H) Allkylic
(C-H) Alkylic ` lt `(C-H)Vinylic `lt`(C-H) Allylic
(C-H) Vinylic =(C-H) Alkylic =(C-H)Allylic

Solution :N//A
Discussion
5.

Isobars have same numbers of

Answer»

protons
electrons
nucleons
neutorns.

Solution :ISOBARS have same mass NUMBER i.e. number of NEUTRONS and protons which are COLLECTIVELY called nucleons.
Discussion
6.

K_(a_(1)), K_(a_(2)) and K_(a_(3)) are the respective ionisation constants for the following reactions.H_(2)S hArr H^(+)+HS^(-)HS^(-)hArr H^(+)+S^(2-)H_(2)S hArr 2H^(+)+S^(2-)The correct relationship between K_(a_(1)), K_(a_(2)) and K_(a_(3)) is

Answer»

`K_(a_(3))=K_(a_(1))XX K_(a_(2))`
`K_(a_(3))=K_(a_(1))=K_(a_(1))+K_(a_(2))`
`K_(a_(3))=K_(a_(1))-K_(a_(2))`
`K_(a_(3))=K_(a_(1))//K_(a_(2))`

Solution :`K_(a_(3))=([H^(+)]^(2)[S^(2-)])/([H_(2)S])`
`=([H^(+)][HS^(-)])/([H_(2)S])xx([H^(+)][S^(2-)])/([HS^(-)])=K_(a_(1))xx K_(a_(2))`
Discussion
7.

Iso-propylamine caimot be obtained by

Answer»




Solution :`(a) (CH_(3))_(2)CO+NH_(2)OHunderset(-H_(2)O)(rarr)(CH_(3))_(2)C=NOH overset("LiAIH"_(4))(rarr)(CH_(3))_(2)CHNH_(2)`
(B) `(CH_(3))_(2)COoverset(NH_(3).Delta)underset(-H_(2)O)(rarr)(CH_(3))_(2)C=NHoverset(H_(2)//Ni)underset((CH_(3))_(2)CHNH_(2))(rarr)`
(c ) `(CH_(3))_(2)CH-Broverset(NaNH_(2))underset(-HBr)(rarr)CH_(3)-CH=CH_(2)`
`(CH_(3))_(2)CHOH+NH_(3)overset(Al_(2)O_(3),633K)underset(-H_(2)O)(rarr)(CH_(3))_(2)CHNH_(2)`
Since `NH_(2)^(-)` is a strong base it prefers to abstract a proton to fonn an alkene RATHER than BRINGING about substitution reaction. Therefore, reaction ( c) cannot give iso-propylamine.
Discussion
8.

K_(a)1 for butyricacidis 2xx10^(-5) .Calculate pH in 0.2M aqueoussolution butrae

Answer»

SOLUTION :`{:(NaBu,+,H_(2)O,hArr,NaOH,+,BuH),(1,,,,0,,0),((1-h),,,,h,,h):}`
` [OH^(-)] = Ch = C sqrt((Kh)/C)= sqrt (K_(n)C) = sqrt((K_(W)C)/(K_(a)))`
` sqrt((10^(-14)xx6.02 )/(2xx10^(-5))) = sqrt(10^(-19)) = 10^(-5)`
`[H^(+)]= 10^(-9)`
` :. pH = 9 `
Discussion
9.

Iso propyl alcohol is obtained by the reaction of the following

Answer»

Acetone with Clemmenson's REDUCING AGENT
Acetone with `H_2` in PRESENCE of Ni
Acetaldehyde with `H_2` in presence of Ni
Acetone with chloroform

ANSWER :B
Discussion
10.

Iso-octane is mixed to the petrol

Answer»

To PRECIPITATE inorganic substances
To PREVENT FREEZING of petrol
To increase boiling POINT of petrol
As an antiknock

Answer :D
Discussion
11.

Iso-octane is added to petrol:

Answer»

To PRECIPITATE inorganic material
To PREVENT FREEZING of petrol
To INCREASE the boiling point of petrol
as an antiknocking agent

Answer :D
Discussion
12.

Isopropylbenzene on air oxidation in the presence of dilute acid gives

Answer»

`C_(6)H_(5) COOH`
`C_(6)H_(5)COCH_(3)`
`C_(6)H_(5)COC_(6)H_(5)`
`C_(6)H_(5)OH`

SOLUTION :` C_(6)H_(5)OH`
Discussion
13.

Iso-octaneis addedto petrol :

Answer»

toprecipitateinorganicmaterial
topreventfreezingof PETROL
TOINCREASE the BOILINGPOINT
as anamntikockingagent

ANSWER :D
Discussion
14.

Iso-butyl bromide reacts with aq. KOH gives

Answer»

iso-butyl alcohol
t-butyl alcohol
n-butyl alcohol
sec. butyl alcohol

Solution :Iso butyl BROMIDE produced iso-butyl cation on heterolysis, it is `1^(@)` carbocation (less STABLE) rearrange to form `3^(@)` carbocation (more stable). Attack of `OH^(-)` on 1-carbocation gives t-butyl alcohol not-iso-butyl alcoho.
`CH_(3)- OVERSET(CH_(3)) overset(|)(CH)-CH_(2)-Broverset( "heterolysis") to underset(1^(@)"carbo-cation")(CH_(3)- overset(CH_(3)) overset(|)C-)CH_(3) overset("rearrangment")to underset(3^(@)"carbo-cation") (CH_(3)-overset(CH_(3)) overset(|)(C^(o+))-C-CH_(3))overset(OH^(-)) to underset("t-butyl alcohol") underset(OH) underset(|) overset(H_(3)) overset(|)(CH_(3)-C-CH_(3))`
Discussion
15.

________is widely used as a solvent for the preparation of grignard reagents.

Answer»

SOLUTION :DIETHYL ETHER.
Discussion
16.

……………………………..is used to product lubricating oils in motors and machinery.

Answer»


ANSWER :NITROBENZENE
Discussion
17.

...............is used to preparesemiconductorgradesilicon or germanium.

Answer»


ANSWER :Zonerefining
Discussion
18.

Ka value of phenol is

Answer»

More than CARBOXYLIC acid
Less than alcohol
More than alcohol
Less than water

Answer :C
Discussion
19.

………….is used in welding purpose.

Answer»

SOLUTION :OXYACETYLENE
Discussion
20.

........................is used in the polymerisation of ethane as a complex catalyst

Answer»


ANSWER :Ziegler-Natta catalyst (or) `[TiCl_(4)]+Al(C_(2)H_(5))_(3)`
Discussion
21.

…………..is used in the match boxes.

Answer»

SOLUTION :RED PHOSPHOROUS
Discussion
22.

………..is used in the manufature of paints ruber and cosmetics.

Answer»

SOLUTION :ZINC OXIDE
Discussion
23.

………………..is used in the manufacture of transparent soap. printing ink and stamp pad ink.

Answer»

SOLUTION :GLYCEROL
Discussion
24.

K_a of phenol is equal to that of ethanol.

Answer»

True
False
PHENOL is basic while ETHYL ALCOHOL is acidic
Can't predict

Solution :`k_a` of phenol is EQUAL to that of ETHNOL.
Discussion
25.

K_(a) of H_(2)O_(2) is of the order of

Answer»

`10^(-12)`
`10^(-14)`
`10^(-16)`
`10^(-10)`

Solution :`H_(2)O_(2)` (Hydrogen peroxide) is a corrosive volatile liquid. It is SLIGHTLY ACIDIC in nature. Its pKa value is APPROXIMATELY `10^(-12)`.
Discussion
26.

K_(a) for the acid HA is 1xx10^(-6). The value of K for the reaction A^(-)+H_(3)O^(+)hArr HA+H_(2)Ois:-

Answer»

`1XX10^(-6)`
`1xx10^(12)`
`1xx10^(-12)`
`1xx10^(6)`

ANSWER :D
Discussion
27.

..........................is used in the manufacture of pairs

Answer»


ANSWER :GLYPTAL
Discussion
28.

K_a for HCN is 5 xx 10^-10 at 25^@C. For maintaining a constant pH of 9. Find the volume of 5 M KCN solution required to be added to 10 mL of 2 M HCN solution.

Answer»

4 ml
7.95 ml
2 ml
9.3 ml

Answer :C
Discussion
29.

…………..is used in the making item of machine

Answer»

SOLUTION :ALUMINIUM
Discussion
30.

Ka for H_(3)BO_(3) "is" 5.8xx10^(-10) what buffer component ratio [NaH_(2)BO_(3)(aq.)]//[H_(3)BO_(3)(aq.)] would be needed to make a buffer solution of pH=10.

Answer»

10
0.18
4.3
5.8

Solution :`pH=pKa+log.([NaH_(2)BO_(3)])/([H_(3)BO_(3)])`
`[H^(+)]=Kaxx([H_(3)BO_(3)])/([NaH_(2)BO_(3)])`
`10^(-10)=5.8xx10^(-10)XX([H_(3)BO_(3)])/([NaH_(2)BO_(3)])`
Discussion
31.

……….is used in packing materials for food items.

Answer»

SOLUTION :ALUMINIUM FOILS
Discussion
32.

K_(a) for CH_(3)COOH at 25^(@)C is 1.754xx10^(-5). At 50^(@)C, K_(a) is 1.633xx10^(-5) what are DeltaH^(0) and DeltaS^(0) for the ionisation of CH_(3)COOH ?

Answer»

SOLUTION :`(DELTAG^(@))_(298)=-2.303RTlogK`
`=-2.303xx8.314xx298xxlog(1.754xx10^(-5))`
`=27194J`
`(DeltaG^(@))_(298)=-2.303xx8.314xx323xxlog(1.633xx10^(-5))`
`=29605J`
`DeltaG^(@)=DeltaH^(@)-TDeltaS^(@)`
`29605=DeltaH^(@)-323DeltaS^(@)`
`:.DeltaH^(@)=-1.55kJ//mol`
`DeltaS^(@)=-96.44J//molK`
Discussion
33.

……………..is used in extraction of gold and platnium.

Answer»

SOLUTION :CHLORINE
Discussion
34.

K_(a) for butyric acid is 2.0 xx 10^(-5). Calculate pH and hydroxyl ion concentration in 0.2 M aqueous in 0.2 M aqueous solution of sodium butyrate

Answer»


Solution : `{:(,NaBu+,H_(2)O hArr,NaOH+,BUH),("Conc. before HYDROLYSIS",1,,0,0),("Conc. after hydrolysis",1-h,,h,h):}`
`:. [OH^(-)] = C.hCsqrt((K_(h))/(C)) = sqrt(K_(h).C) = sqrt((K_(w).C)/(K_(a)))`
`[OH^(-)] = (10^(-14) xx 0.2)/(2 xx 10^(-5)) = sqrt(10^(-10)) = 10^(-5)`
`:. pOH = -log[OH^(-)] = 5` and so pH = 14 - 5 = 9
Discussion
35.

……………is used in gunpower for firearms.

Answer»

SOLUTION :NITRIC ACID/`NaNO_(3)`
Discussion
36.

K_(6)[(CN)_(5) Co-O-O-Co(CN)_(5)]overset("oxidised")to (X) K_(5)[(CN)_(5)Co-O-O-Co(CN)_(5)] (Y) In both the complexes Co have t_(2g)""^(6)e_(g)""^(0) configuration. The bond energy of (O-O)in X and Y is:

Answer»

bond ENERGY of `(O-O)` in `Ylt` bond energy of `(O-O)` in X.
bond energy of `(O-O)` in `Xlt` bond energy of `(O-O)` in Y.
bond energy of `(O-O)` in X=bond energy of `(O-O)` in Y.
bond energy of `(O-O)`in X and bond energy of `(O-O)` in y can't be comparable.

Answer :B
Discussion
37.

……………is used for the manufacture of calcium cyanamide

Answer»

SOLUTION :NITROGEN
Discussion
38.

K_(a) and K_(a) are the "Ind and ind ionization constants of maleic acid whereas K_(a_(1)) andK_(a_(1))are those of fumaric acid, then choose the correct options among the following:

Answer»

 `pK_(a_(1))gtpK_(a_(1))`
 `pK_(a_(2))gtpK_(a_(2))`
 `pK_(a_(1))gtpK_(a_(1))`
 `pK_(a_(2))gtpK_(a_(2))`

SOLUTION :B,C
Discussion
39.

……………is used for producing smoke screen.

Answer»

SOLUTION :PHOSPHINE
Discussion
40.

K_(4)[Fe(CN)_(6)]+M^(x+)(aq.)to underset("Coloured precipitate")(M_(4)[Fe(CN)_(6)]_(x)darr) Which of the following cation does not respond to the above reaction?

Answer»

`CU^(2+)(aq.)`
`FE^(3+)(aq.)`
`ZN^(2+)(aq.)`
None of these

Solution :`K_(4)[Fe(CN)_(6)]+Zn^(2+)(aq.)tounderset(("White ppt."))(Zn_(2)[Fe(CN)_(6)]darr)`
Discussion
41.

……………….is used for extraction of glue from bone.

Answer»

SOLUTION :Hydrochyloric ACID
Discussion
42.

K_(4)[Fe(CN)_(6)] is usedto test Cu^(2+),Fe^(2+),Zn^(2+),Cd^(2+)

Answer»


Solution :`Na(FE(CN)_(6)]` give differentcoloured pptwith `Cu^(2+),Fe^(2+),Zn^(2+),CD^(2+)`
`2Cu^(2+)+ K_(4)[Fe(CN)_(6)] rarr underset(chocolate coloured )(Cu_(2)[Fe(Cn)_(6)]) + 4K^(Theta)`
`Fe^(2+) + K_(6) [Fe(CN)_(6)) rarr underset(blue)(KFe^(III)[Fe^(II)(CN)_(6)]) + 3K^(oplus)`
Discussion
43.

...................is used for making magnetic recording tapes.

Answer»


ANSWER :DACRON or TERYLENE
Discussion
44.

………………………is used as percursor to explosive.

Answer»


ANSWER :NITRO ETHANE
Discussion
45.

K_(4)[Fe(CN)_(6)] is used in the identification of:

Answer»

`FE^(2+)` ions
`Fe^(3+)` ions
`Cu^(2+)` ions
`Cd^(2+)` ions

Solution :`4Fe^(3+)+3K_(4)[Fe(CN)_(6)]TOFE[Fe(CN)_(6)]_(3)+12K^(+)` preussion blue `Fe^(2+)underset(Delta)toFe^(3+)overset(K_(4)[Fe(CN)_(6)])to` Prussion blue
`2Cu^(2+)+K_(4)[Fe(CN)_(6)]toCu_(2)[Fe(CN)_(6)]darr+` reddish BROWN `2K_(2)SO_(4)`
Discussion
46.

____is used as cataylst in the manufacture of H_2SO_4 acid by contact process.

Answer»

`V_2O_5`
`PT`

SOLUTION :`V_2O_5`
Discussion
47.

___is used as catalyst by Ostwald process for manufacture of nitric acid.

Answer»

SOLUTION :PLATINUM
Discussion
48.

K_(4)[Fe(CN)_(6)] is slightly yellow coloured due to :

Answer»

charge transfer
more polarization plane
unpaired ELECTRONS
none of these

Solution :`K_(4)[FE(CN)_(6)]` is diamagnetic but EXHIBITS colour due to MLCT.
Discussion
49.

…………is used as a reducing agent for the reduction of chromic oxide

Answer»

SOLUTION :ALUMINIUM
Discussion
50.

K_(4)[Fe(CN)_(6)] is used in the identification of

Answer»

`Fe^(2+) ions`
`Fe^(3+)ions` 
`Cu^(2+)ions`
`CD^(2+) ions`

Answer :B::C
Discussion