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.

Select the pair of compounds which exhibit cis-trans (geometrical) isomerism:

Answer»

fumaric ACID and maleic acid
malonic acid and succinic acid
lactic acid and TARTARIC acid
acetic acid and crotonic acid.

Answer :A
Discussion
2.

Select the organic compounds which was prepared for the first time in laboratory from in elements:

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UREA
`CH_3COOH`
`C_2H_5OH`
NONE of the above

Answer :B
Discussion
3.

Select the organic compounds which burn with non smoky flame:

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`CHCl_3`
`C_6H_6`
`C_6H_5CH_2OH`
`C_6H_5CHO`

ANSWER :C
Discussion
4.

Select the option in which heat evolved is maximum. Given : Delta_(f)H^(@) (CO_(2), g) = -75 k Cal//mol, ""Delta_(f)H^(@) (CO, g) = -25 k Cal//mol The product will be CO if excess amount of carbon is present and CO_(2) if excess O_(2) is present

Answer»

10 moles of CARBON and 4.5 moles of `O_(2)`
24 gmof carbon and 64 GM of `O_(2)`
4 moles of carbon and 3.5 moles of `O_(2)`
30 gm of carbon and 80 gm of `O_(2)`

Solution :(a) `{:(C,+,1/2 O_(2) rarr,CO),(10,,4.5 (L.R.),0),(,,,9):}`
energy released `=9xx-25=-225`
(b) `{:(C,+,1/2 O_(2),rarr,CO_(2),),(2,,2,,0,),(L.R.,,1,,2,DeltaH=-50),(CO+1/2 O_(2) rarrCO_(2),,,,,DeltaH=-100):}`
`{:(2,,1,,2):}`
Total `DeltaH=-150`
(C) `{:(C,+,1/2O_(2),rarr,CO,),(4,,3.5,,0,),(L.R.,,1.5,,4,DeltaH=-25xx4=-100),(,,,,,),(CO,+,1/2O_(2),rarr,CO_(2),),(4,,1.5,,0,),(,,L.R.,,3,DeltaH-3xx50=-150),(,,,,,"Total "DeltaH=-250):}`
(D) `{:(C,+,1/2O_(2),rarr,CO,),(2.5,,2.5,,0,DeltaH=-25xx2.5=62.5),(L.R.,,1.25,,2.5,),(,,,,,),(CO,+,1/2O_(2),rarr,CO_(2),),(2.5,,1.25,,0,DeltaH=-2.5xx50=125),(0,,,,2.5,),(,,,,,"total "DeltaH=62.5+125=187.5):}`
Discussion
5.

Select the optically inactive compound among the following:

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ANSWER :D
Discussion
6.

Select the only incorrect option for gold sol.

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<P>(II) (ii) (P)
(II) (III) (S)
(III) (iv) (S)
(II) (iii) (Q)

ANSWER :D
Discussion
7.

Select the only incorrect option.

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<P>(III) (i) (P)
(I) (ii) (Q)
(IV) (i) (R )
(IV) (ii) (Q)

Answer :B
Discussion
8.

Select the only incorrect option for Agl//I^(-) sol.

Answer»

(II) (ii) (P)
(IV) (iv) (P)
(II) (III) (S)
(IV) (iii) (Q)

ANSWER :D
Discussion
9.

Select the only incorrect option.

Answer»

(III) (II) (Q)
(IV) (ii) (S)
(II) (iv) (P)
(II) (ii) (S)

ANSWER :D
Discussion
10.

Select the only INCORRECT combination among the following is

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(II) (III) (S)
(I). (IV) (R)
(III).(i) (Q)
(IV)(iii)(R)

ANSWER :D
Discussion
11.

Select the only correct option Fe(OH)_(3) sol.

Answer»

(I) (III) (Q)
(IV) (i) (Q)
(I) (iii) (R)
(IV) (iv) (S)

ANSWER :B
Discussion
12.

Select the only correct option.

Answer»

<P>(I) (i) (P)
(II) (ii) (Q)
(I) (ii) (S)
(II) (III) (Q)

ANSWER :A
Discussion
13.

Select the numbers with same significant figures:

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`6.02xx10^(23)`
0.25
`6.60xx10^(-34)`
`1.50`

ANSWER :A::C::D
Discussion
14.

Select the number of compounds in which deprotonation gives aromatic anion:

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ANSWER :A::B::C::D
Discussion
15.

Select the natural rubber from the following.

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ISOPRENE
Nitro CELLULOSE
Polythene
Bakelite

Solution :Isoprene
Discussion
16.

Select the most suitable alcohol and oxidant to parpare the following compounds.

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SOLUTION :
Discussion
17.

Select the most stable carbocation:

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ANSWER :D
Discussion
18.

Select the most reactive compound towards the attack of MeMgBr followed by hydrolysis?

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`Me-OVERSET(O)overset(||)C-Me`
`PH-overset(O)overset(||)C-Me`
`Ph - overset(O)overset(||)C- Ph`
`Me - overset(O)overset(||)C-H`

ANSWER :D
Discussion
19.

Select the most reactive cycloalkane:

Answer»

Cyclopropane
Cyclobutane
Cyclopentane
Cyclohexane

Answer :A
Discussion
20.

Select the molecule with more polar bond from each of the indicated bonds among given set of molecule : (a) H_(3)Cunderset((I))(-)H,(H_(3)C)underset((II))(-)Br (b)H_(3)Cunderset((I))(-)NH_(2),underset((II))(H_(3)C)-OH (c ) H_(3)Cunderset((I))(-)OH,underset((II))(H_(3)C)-SH

Answer»

I,I,I
II,II,II
II,II,I
II,I,II

Answer :C
Discussion
21.

Select the member of each pair that shows faster rate of SN2 reaction with Kl in acetone. CH_(3)-underset((I))CH_(2)-CH_(2)-ClorH_(3)C-underset((II))underset(CH_(3))underset(|)CH-CH_(2)-Cl (B) CH_(3)-underset((I))CH_(2)-CH_(2)-ClorCH_(3)-underset((II))CH_(2)-CH_2-Cl (C) CH_(3)-underset((I))underset(CH_(3))underset(|)CH-CH_(2)-CH_(2)-ClorCH_(3)-underset((II))underset(H_(3)C)underset(|)overset(H_(3)C)overset(|)CH_(2)-CH_(2)Cl CH_(3)-CH_(2)underset((I))-CH_(2)-overset(Br)overset(|)CH_(2)-CH_(3)orCH_(3)-underset(H_(3)C)underset(|)CH-underset((II))CH_(2)-overset(Br)overset(|)CH_(3)

Answer»

SOLUTION :`(A)TOI,(B)TOII,(C)toI,(D)toI`
Discussion
22.

Select themaor product formed from reaction of 2-bromo butane and lacoholic KOH

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trans `CH_(3)CH=CHCH_(3)`
cis `CH_(3)CH=CHCH_(3)`
`CH_(2)=CHCH_(2)CH_(3)`
`CH_(2)CH=CH_(3)`

Solution :Accroding to Sytzerff's reule, in dehydrohalogenation , the H atom is ELIMINATED fromt eh `BETA-` CARBON atom has fewer NUMBER of hydrogens.Out of 2-butene major product is trans 2-butenebecause it is more STABLE than cis 2-butene, due to less crowding and less Van der Walls' strian.
Discussion
23.

Select the longest continous chain in each of the following molecules.

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SOLUTION :
Discussion
24.

Select the major product from the following reaction sequence.

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ANSWER :C
Discussion
25.

Select the intermediate in the following reaction mechanism O_(3(g))toO_(2(g))+O_((g))+O_(3(g))to 2O_2

Answer»

`O_(3(G))`
`O_((g))`
`O_(2(g))`
none

SOLUTION :The INTERMEDIATE species is ONE which is fomed and used up during the course of reaction.
Discussion
26.

Select the intermediate in the following reaction mechanism:O_3(g)iffO_2(g)+O(g)O(g)+O_3(g)to2O_2

Answer»

`O_3(G)`
`O(g)`
`O_2(g)`
NONE of the above

Answer :B
Discussion
27.

Select the incorrectly matched options :

Answer»

`R-CO-CH_(3)OVERSET(Zn//Hg)underset(conc.HCl)rarrR-CH_(2)-CH_(3)` (Clemmensen REDUCTION)

`R-CHO+N_(3)Hunderset((330-341K))overset(conc.H_(2)SO_(4))rarrR-CN+RNHCO+N_(2)` (Schmidt reaction)
`BrCH_(2)COOC_(2)H_(5)+Znoverset("Dry ether")rarrBrZn-CH_(2)COOC_(2)H_(5)` (Perkin reaction )

Answer :B
Discussion
28.

Select the incorrect statment:

Answer»

The C. N. of cation OCCUPYING a tetrahedral HOLE is 4
The C.N of cation occupying a octahedral is 6.
In Schottky defects,density of the LATTICE decreases.
In Frenkel defects, density of the lattice increases.

Answer :D
Discussion
29.

Select the incorrect statemnt.

Answer»

`SO_(2)` GAS has oxidisingas well as reducingbehaviour .
`D_(2)O` reacts slowlythan ` H_(2)O` in chemicalreactions
`KI_(s)`reacts with conc.`H_(2)SO_(4)`to produce HI
`O_(3)`oxidises KI to `I_(2)`of the given reaction is

SOLUTION :`2KI + H_(2)SO_(4) to K_(2)SO_(4) + 2HI`
` 2HI + H_(2)SO_(4) to2 H_(2)O + SO_(2) + I_(2)`
Discussion
30.

Select the incorrect statements on the basis of curve given below for real gas(A).

Answer»

For 1 mol, `V_(C) = (48)/(3) pi r^(3) XX N_(A)`
Difference in densities of liquid and gas at `T_(2)` and `P_(2)` is less than that at `T_(1)` and `P_(1)`.
At temperature `T_(C)` and pressure `P_(C)` density of gas and liquid becomes almost equal.
At point B, SUBSTANCE A exists in liquid STATE only.

Answer :D
Discussion
31.

Select the incorrect statement(s)/order (s):

Answer»

d-orbital can accommodate 10 electrons
`underset(2s^(2)2P^(6)3s^(1))(Na) overset(I.E_(1)) underset(2s^(2)2p^(6))(Na^(+)) overset(I.E_(2)) to underset(2s^(2)2p^(5))(Na^(2+))overset(I.E_(3)) to underset(2s^(2)2p^(4)) (Na^(3+))`, ORDER of successive I.E. is `I.E_(1) LT I.E_(2) lt gtI.E_(3)`
Number of unpiared electrons in `Co^(2+)` cationgt Number of unpaired electrons in `Co^(3+)` cation
First ionisation energy of Pt is greater than that of Pd

Answer :A::B::C
Discussion
32.

Select the incorrect statements from the following:

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The ratio of `SIGMA` bonds to `pi` bonds in `SO_(3)` and `SO_(2)` are same
The hybridisation of S in `SO_(3)` and `SO_(2)` is same
The S atom in `SO_(3)` is more electronegative as COMPARED to that in `SO_(2)`.
`SO_(3)` is PLANAR whike `SO_(2)` is NON-planer.

Solution :`SO_(2)` can not be non planar
Discussion
33.

Select the incorrect statements about the following

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`O_(3)` is USED as germicide for purification of AIR
In `O_(3),O-O` BOND length is identical with that of molecular oxygen
`O_(3)` molecule is angular in shape
`O_(3)` is an oxidizing AGENT

Solution :In `O_(3),O-O` bond length is not identical with that of molecular oxygen. It is found to be intermediate of O-O and O=O bond length. This ARISES due to resonance .
Discussion
34.

Select the incorrect statement(s) about C_(2) molecule

Answer»

It exists in vapour PHASE
It CONTAINS 12 electrons out of which 8 are present in bonding ORBITALS and 4 in antibonding orbitals.
It is paramagnetic in nature.
It contains double bonds of which both are `pi`- bonds.

Solution :`C_(2)(12):KKsigma2sS^(2)sigma***2s^(2)pi2p_(x)^(2)=pi2p_(y)^(2)`
It exists in vapour phase and is diamagnetic in nature because it contains no unpaired electrons.
Since four electrons are present in TWO `p_(i)`- molecular orbitals so the double bond contains both` pi`- bonds.
Discussion
35.

Select the incorrect statement(s):

Answer»

Magnesium can be burnt in the ATMOSPHERE of `CO_(2) and SO_(2)`
Magnesium reacts with alkyl HALIDES to form Grignard's reagent
Out of MG and Ca, only Mg reacts with `N_(2)` to form magnesium nitride
Calcium is less reactive than magnesium

Answer :C::D
Discussion
36.

Above which temperature, hydrous calcium sulphate is converted into dead burnt plaster :-

Answer»

313 K
373 K
413K
393 K

Answer :D
Discussion
37.

Select the incorrect statements :

Answer»

Size of `H^(-)`is larger than `F^(-)`
Rb is more ELECTROPOSITIVE compared to CA
`Na^(+)` is more electronegative than the Na
`Cl^(-)`is more electronegative than that of F

Answer :D
Discussion
38.

Select the incorrect statement on basis of following conversion :- underset("Ore")underset("coloured")underset("Black")(X) underset("air")overset(KOH)tounderset("green")underset("Dark")(Y)overset(H^(o+))tounderset("agent")underset("an oxidising")(Z)+X

Answer»

X MAY be `MnO_(2)`
Y can be `K_(2)MnO_(4)`
Z can be `KMnO_(4)`
NONE of these

Answer :D
Discussion
39.

Select the incorrect statement ( s) :

Answer»

At Boyle's temperature a real gas BEHAVES like an ideal gas IRRESPECTIVE of pressure.
At critical condition, a real gas behaves like an ideal gas.
On increasing the temperature four times, collision frequency `( Z_(11))` BECOMES double at constant volume.
At high pressure VANDER Waal's constant 'b' dominates over 'a'

Answer :A,B
Discussion
40.

Select the incorrect statement regarding gamma- form of SO_(3)

Answer»

SULPHUR has `sp^(3)` hybridisation
It is non planar structure
It has six `p pi-d pi` bonds.
All S-O BOND length are same.

Solution :
`GAMMA-` forms of `SO_(3)`-TRIMER of `SO_(3)=S_(3)O_(9)`
Hybridisation `sp^(3)`
Non planar
Six `p pi-d pi` bonds are present
All S-O bond length are not same.
Discussion
41.

Select the incorrect statement regarding B_(2)H_(6).

Answer»

It CONTAINS B-B IONIC bond
Each BORON is `sp^(3)` hybridised
It has two types of HYDROGEN bonds
it is used as a reducing agent.

ANSWER :A
Discussion
42.

Select the incorrect statement in the gas equation, PV= nRT

Answer»

n is the number of molecules of a GAS
V DENOTES volume of one mole of the gas
n MOLES of the gas have a volume V
P is the pressure of the gas when n moles of gas is present

Answer :A::B
Discussion
43.

Select the incorrect statement for the metallurgy of aluminum:

Answer»

Bauxite can be enriched by BAYER's process
Al' is produced by electro lytic reduction of `Al_(2)O_(3)`
REFINING of 'Al' is process by Hoope's electrolysis.
Electrolysis of 'Al' has mixture of `Al_(2)O_(3) + Na_(3)Alf_(6) + CaF_(2)` as electrolyte.

Solution :Al' is produce by electrolytic reduction of `Al_(2)O_(3)`
Discussion
44.

Select the incorrect statement amoung the following .

Answer»

ZEOLITES are used in petrochemical INDUSTRIES for CRACKING of hydrocarbons
Zeolites has two dimensional structure
Hydrated zeolites are used as ION exchangers in softening of hard water
ZSM-5 is used to convert alcohols directly into gasoline

Answer :B
Discussion
45.

Select the incorrect statement for B_(2)H_(6)

Answer»

It CONTAINS B-B ionic bond
Each BORON is `SP^(3)` hybridised
it has two TYPES of hydrogen bonds
All of these

Answer :A
Discussion
46.

Select the incorrect statement , among the following

Answer»

Haemoglobin is soluble in water
`ALPHA`-Keratin is soluble in water
Cellulose is a POLYMER of glucose
CHLOROPHYLL is responsible for the synthesis of carbohydrates in plants.

Solution :`alpha`-Keratin is INSOLUBLE in water.
Discussion
47.

Select the incorrect statement about the following :

Answer»

`O_3` molecular is angular in SHAPE
In `O_3` , O - O bond LENGTH is identical with that of molecular oxygen
`O_3` is used as GERMICIDE for purification of AIR
`O_3` is an oxidizing agent

Answer :B
Discussion
48.

Select the incorrect statement among the following

Answer»

Hemoglobin is soluble in WATER
`alpha` - KELA tin is soluble in water
Cellulose is a polymer of GLUCOSE
Chlorophyll is responsible for the synthesis of carbohydrates in PLANTS.

Solution :`alpha` - Kela tin is soluble in water
Discussion
49.

Select the incorrect statement about the boron.

Answer»

Pure FORM of the elements are obtained by the reduction of `BCl_(3)` with zinc at `900^(@)C`.
Crystalline boron is attacked only by hot concentrated oxidising agents.
Amorphous boron and ammonia at white GIVES `(BN)_(x)`, a slippery white solid with a layer structure resembling that of graphite.
Boron does form `B^(3+)` cation easily.

Solution :Due to small size of boron the sum of its first three ionization ENTHALPIES is very high.This prevents it to form `+3` ions.
Discussion
50.

Select the incorrect statement about nylon 2-nylon-6 :

Answer»

It is a copolymer.
It is biodegradable.
It is an ALTERNATING polymide.
It is made up of `CH_(3)-underset(NH_(2))underset(|)CH-COOH"and" H_(2)N(CN_(2))_(5)COOH`.

Solution :N//A
Discussion