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.

Among the hydrides formed by the group VI-A elements, only H_2 O has an abnormally low volatility (high boiling point). This is so because

Answer»

`H_(2)O` molecules are associated due to intermolecular HYDROGEN bond
`H_(2)O` is COVALENT in nature
The O-H bond in `H_(2)O` is very strong
The electronegativity difference of H and O is very LARGE

Answer :A
Discussion
2.

Among the halogen the one which is oxidised to Nitric acid is

Answer»

FLUORINE
IODINE
CHLORINE
BROMINE

SOLUTION :Iodine
Discussion
3.

Among the halogens, the lowest electronegativity is for:

Answer»

F
Cl
I
Br

Answer :C
Discussion
4.

Among the halogen derivatives of ethane, the one which has the highest boiling point is

Answer»

`C_(2)H_(5)F`<BR>`C_(2)H_(5)CL`
`C_(2)H_(5)Br`
`CH_(3)Br`

Solution :`C_(2)H_(5)I`
Discussion
5.

Among the halogen hydrides, which has maximum per cent of ionic character ?

Answer»

Solution :HF has the MAXIMUM per cent ionic CHARACTER because of maximum ELECTRONEGATIVITY difference between hydrogen ATOM and halogen atom.
Discussion
6.

Among the halogen acids, the weakest acid is _______.

Answer»

HF
HCl
TNT
HI

Answer :A
Discussion
7.

Among the given hydroxyl compound how many will give precipitate immediately when treated with concentrated hydrochloric acid and anhydrous zinc chloride. 3-methyl-2-butanol, 3-methyl-1-butanol, 1-butanol, 2-methyl-2-butanol, 2,3-dimethyl-2-butanol, 2,3-dimcthyl-1-butanol

Answer»


Solution :Structure of given alcohols
`underset(3-"methyl-2-BUTANOL")CH_(3)-underset(CH_(3))underset(|)CH-underset(OH)underset(|)CH, underset("2-methyl-2-butanol")(CH_(3)-CH_(2)-overset(CH_(3))underset(|)underset(OH)underset(|)C-CH_(3)`
`underset("3-methyl-butanol")(CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)-CH_(2)OH, underset("2,3-dimethyl-1-butanol")(CH_(3)-overset(CH_(3))overset(|)CH-overset(CH_(3))overset(|)CH-CH_(2)OH)`
`underset(1^(@) "ALCOHOL")underset(1-"butanol")(CH_(3)-CH_(2)-CH_(2)-CH_(2)OH), underset(3^(@)"alcohol")underset("2,3-dimethyl-2-butanol")(CH_(3)-overset(CH_(3))overset(|)(CH) - underset(OH)underset(|)overset(CH_(3))overset(|)C-CH_(3)`
2,3-dimethyl -2-butanol and 2-methyl-2-butanol being tertiary alcohol gives PRECIPITATE immediately with cone. HCl and anhydrous `ZnCl_(2)`.
Discussion
8.

Among the given geminal diols, which is/are stable with respect to their corresponding carbonyls?

Answer»




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

Amongthe givencompounds , themostsusceptible tonuclephilic attack at thecarbonylgroup is .

Answer»



`H_3C-CHO`

Solution :Amongaldehydes and the acid derivative ,acidchlorides are the mostsuceptibleto nucleophilicattackdue to STRONG- Ieffectandweak+R EFFECTOF the CI atom.Asa RESULTOF which carbonylC atomhas thehighestelectrondeficieny. The actualorder .
`MeCOCl gtMeCO- O-COMe GT Me -COOMegtMeCHO`.
Discussion
10.

Among the given compounds the most susceptible to nucleophilic attack at the carbonyl group is

Answer»

`CH_(3)COCL`
`CH_(3)COOCH_(3)`
`CH_(3)CONH_(2)`
`CH_(3)COOCOCH_(3)`

SOLUTION :`CH_(3)-UNDERSET(O)underset(||)(C)-Cl` has more bond length of `C-Cl` bond due to big size of Cl.
`therefore`more reactive COMPOUND.
Discussion
11.

Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is:

Answer»

`CH_(3)COOCH_(3)`
`CH_(3)CONH_(2)`
`CH_(3)COOCOCH_(3)`
`CH_(3)COCl`

ANSWER :D
Discussion
12.

Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl carbon is

Answer»

MeCOCl
MeCHO
MeCOOMe
MeCOOCOMe

Solution :Rate of NUCLEOPHILIC attack `prop` AMOUNT of +Ve CHARGE at carbonyl carbon.
Discussion
13.

Among the given compound most susceptible to uncleophilic attack at carbonyl group is

Answer»

`HCHO`
`MeCOOMe`
`MECHO`
`MeCOOCO me`

ANSWER :A
Discussion
14.

Among the given compounds

Answer»

`III gt IV gt I gt II`
`I gt IV gt II gt III`
`III gt I gt IV gt II`
`III gt I gt II gt IV`

ANSWER :C
Discussion
15.

Among the given cations, the most stable carbonium ion is

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Sec-butyl
Ter-butyl
n-butyl
None of these

Solution :
GREATER the no. of ALKYL groups, greater would be the DISPERSAL of the charge and hence more stable will be the CARBONIUM ion.
Discussion
16.

Among the calamine, cuprite,zincite, chalcocite, heamatite, bauite , magnatite, Cassiterite. The number of oxide ores?

Answer»


SOLUTION :Galena-Pbs, PYROLUSITE `-MnO_(2)`
Zincite -ZnO, Rutilte `TiO_(2)`
Matachite `-CuCO_(3).Cu(OH)_(2)`
Azurite `-2CuCO_(3).Cu(OH)_(2)`
CAssiterite - `SnO_(2)`
`:.` Number of oxide ores =4
Discussion
17.

Among the followng which is said

Answer»

`Ibr`
`CIF_(3)`
`BrF_(5)`
`IF_(7)`

SOLUTION :Ibr solid, `ClF_(3)` and `IF_(7)` are GASES, while `BrF_(5)` is liquid.
Discussion
18.

Among the followings , the one which is not a " greenhouse gas " , is

Answer»

`N_2O`
`CO_2`
`CH_4`
`O_2`

SOLUTION :`O_2` is not a GAS responsible for the rise in TEMPERATURE of the earth
Discussion
19.

Among the following.find out number of ions or molecules that can show backbonding.

Answer»


SOLUTION :
Discussion
20.

Among the following which will not respond to iodoform test

Answer»




ANSWER :D
Discussion
21.

Among the following, which the maximum hydration energy?

Answer»

`OH^(-)`
`NH_(4)^(+)`
`F^(-)`
`H^(+)`

Answer :D
Discussion
22.

Among the following which statement is not correct:

Answer»

RATES of NITRATION of `C_(6)H_(6)` and `C_(6)D_(6)` under same experimental condition are equal.
C-D bond is stronger than C-H bond.
Sulphonation is a reverible reaction.
In sulphonation `ALPHA` complex formation is the rate DETERMINING step.

Answer :D
Discussion
23.

Among the following which statement is not correct

Answer»

` CH_3-overset(O)overset(||)C-OH` will not respond to halform test
Schiff's reagent and Schiff's BASE are different compound
Fehling SOLUTION is a good reagent to detect aromatic aldehydes
Both ALDEHYDE and ketone can REACT with 2,4-dinitrophenylhydrazise reagent

Answer :C
Discussion
24.

Among the following which statement is/are correct. (A)CH_3-oversetoverset(O)(||)C-OHoverset(X_2//OH^(-))toWill not respond to haloform test (B)CH_2=CH-CH=Ooverset(overset(Theta)OH//Delta)to Gives cannizzaro reaction. ( C)Cl-undersetunderset(Cl)(|)oversetoverset(Cl)(|)C-CH=Ooverset(oversetthetaOH//Delta)toDoes not give cannizzaro reaction. (D)

Answer»


SOLUTION :(A)acid cannot give iodoform reaction.
(B)lacks in a`alpha`-HYDROGEN. It gives cannizzaro.
(C )It can give haloform reaction because of `C Cl_3` GROUP.
Discussion
25.

Among the following which statement is incorrect ?

Answer»

`CH_(3)-overset(O)overset(||)C-Ohoverset(X_(2)//OH^(-))rarr` will not respond to haloform test
`CH_(2)=CH-CH=Ooverset(overset(o+)((OH))//Delta)rarr` GIVES cannizaro reaction
`Cl-overset(Cl)overset(|)UNDERSET(Cl)underset(|)C-CH=Ooverset(overset(o+)(OH)//Delta)rarr ` does not GIVE cannizaro reaction

Answer :D
Discussion
26.

Among the following which statement are correct?

Answer»

Both N of pyrimidine are of same BASIC strength
In inmidazole, protonation takes PLACE on `N-3`
Purine has 3 basic N
Purine, IMIDAZOLE and pyrimidine all are aromatic

Solution :N/A
Discussion
27.

Among the following which statement are correct?

Answer»

Conjugate base of (I) is more STABLE than that ofphenol (II)
CONJUGATED base of (II) is more stable than that of benzoic acid (I)
Megnitude of positive CHARGE on H ATOM of -OH group is greaterin (I) than(II).
NONE of the above

Solution :N/A
Discussion
28.

Among the following, which solutions contian equal numbers of millimoles ?

Answer»

100 ML of 0.05 M `H_(2)SO_(4)`
200 mL of 0.05 M NaOH
100mL of 0.010 M `Na_(2)C_(2)O_(4)`
200mL of 0.025 M KOH

Answer :A,D
Discussion
29.

Among the following which should have the highest rms speed at the same temperature?

Answer»

`SO_(2)`
`CO_(2)`
`O_(2)`
`H_(2)`

Solution :We know rms SPEED C`=sqrt((3RT)/M)`
So if temperature REMAINS the same `cprop 1/(sqrt(M))`
So GAS with least molecular weight will have the HIGHEST r.m.s speed
Discussion
30.

Among the following which one is wrong statement ?

Answer»

`PH_(5) and BiCl_(5)` do not EXIST
`p pi - d pi` bonds are present in `SO_(2)`
`SeF_(4) and CH_(4)` have same SHAPE
`I_(3)^(+)` has bent geometry

Solution :`H_(2)` being a weak oxidising agent, it cannot OXIDISE P to its highest O.S. of +5 and hence `PH_(5)` does not exist. Similarly, `Cl_(2)` being a weak oxidising agent, it cannot oxidise Bi to its highest O.S. of +5 and hence `BiCl_(5)` does not exist. Thus, option (a) is correct.
`SO_(2)` has one `p pi-d pi` bond. Thus option (b) is also correct.
In `SeF_(4)`, Se is `dsp^(3)` hybridized and hence it has trigonal bipyramidal geometry while in `CH_(4)`, C is `sp^(3)`-hybridized and hence it has tetrahedral structure. Thus, option (c) is wrong.
`I_(3)^(+)` has bent structure. This option is also correct.
Discussion
31.

Among the following which property is commonly exhibited by a covalent compound

Answer»

HIGH solubility in water
High ELECTRICAL conductance
Low BOILING point
High melting point

ANSWER :C
Discussion
32.

Among the following which one is strongest base?

Answer»

AMMONIA
Methylamine
Ethylamine
NONE of these

Answer :C
Discussion
33.

Among the following which one is paramagnetic and has tetrahedral geometry?

Answer»

`[Ni(CN)_(4)]^(2-)`
`[NiCl_(4)]^(2-)`
`[Ni(CO)_(4)]`
`[CoCl_(2)(EN)_(2)]^(+)`

SOLUTION :`[NiCl_(4)]^(2-)` is tetrahedral having two UNPAIRED electrons.
Discussion
34.

Among the following which one is more acidic ? Give reason. H_(2)O,H_(2)S,H_(2)Se and H_(2)Te

Answer»

SOLUTION :`H_(2)Te` is more acidic, because the SIZE of the central atom INCREASES. The bond (H—Te) dissociation ENTHALPY in`H_(2)Te` is low, therefore the `H^(+)`ion is easily LOST.
Discussion
35.

Among the following ,which one is the wrong statement

Answer»

`PH_5` and `BiCl_5` do not EXIST
`P PI - d pi` BONDS are presents in `SO_2`
`SeF_4 and CH_4` have same shape
`I_3^(+)` has bent shape

ANSWER :C
Discussion
36.

Among the following which one has weakest carbon-halogen bond ?

Answer»

BENZYL BROMIDE
BROMOBENZENE
VINYL bromide
Benzyl chloride

Answer :A
Discussion
37.

Among the following which one has the shortest Cl-O bond length

Answer»

`ClO^(-)`
`ClO_(3)`
`ClO_(2)`
`ClO_(4)`

SOLUTION :`ClO_(4)^(-)` has short bond length
`{:("Formula","B. length"),(OCL^(-), 170 p m),(ClO_(2)^(-),164 p m),(ClO_(3)^(-), 157 p m ),(ClO_(4)^(-), 145 p m):}`
Discussion
38.

Among the following which one has the highest cation to anion size ratio?

Answer»

NaF
CsI
CsF
LiF

Solution :`(M^(+))/(X^(-))` is highest in CsF
`therefore` correct CHOICE (C).
Discussion
39.

Among the following which one can have a meso form

Answer»

`CH_(3)CH(OH)CH(Cl)C_(2)H_(5)`
`CH_(3)CH(OH)CH(OH)CH_(3)`
`C_(2)H_(5)CH(OH)CH(OH)CH_(3)`
`HOCH_(2)CH(Cl)CH_(3)`

Solution :It is plane of symmetry.
Discussion
40.

Among the following which one does not act as intermediate in Hofmann rearrangement?

Answer»

RNCO
RNC
`RCOddotNHBr`
`RCOddotN`

ANSWER :B
Discussion
41.

Among the following, which one acts as a food Preservative?Aspartame, Aspirin, Sodium Benzoate, Parcetamol.

Answer»

SOLUTION :SODIUM BENZOATE / ASPARTAME
Discussion
42.

Among the following, which is the strongest oxidizing agent.?

Answer»

`Cl_(2)`<BR>`F_(2)`
`Br_(2)`
`I_(2)`

SOLUTION :`F_(2)`
Discussion
43.

Among the following which is the strongest oxidising agents:Br_2,I_2,F_2,Cl_2.

Answer»

`Br_2`
`I_2`
`Cl_2`
`F_2`

ANSWER :D
Discussion
44.

Which of the following is the strongest oxidising agent?

Answer»

`Br_(2)`<BR>`I_(2)`
`Cl_(2)`
`F_(2)`

ANSWER :D
Discussion
45.

Among the following which is the strongest oxidising agent?

Answer»

`F_(2)`
`Br_(2)`
`I_(2)`
`Cl_(2)`

Solution :Fluorine is the most electronegative element because electronegativity decreaseson moving down the GROUP. Hence, it GETS reduced READILY into `F^(+)` ion and is the STRONGEST oxidising agent.
Discussion
46.

Among the following which is the most soluble in cold 5% aq NaOH?

Answer»

`CH_(3)(CH_(2))_(3)CO OH`
`CH_(3)(CH_(2))_(2)COCH_(3)`
`CH_(3)(CH_(2))_(2)CHO`
`CH_(3)CH_(2)OH`

Solution :Being Acidic it is soluble in 5% aq. NaOH.
Discussion
47.

Among the following which is the best description of water in the solid phase?

Answer»

Covalent solid
molecular solid
ionic solid
network solid

Solution :Molecular solid is the best DESCRIPTION of water in the solid phase. For EXAMPLE ICE is HYDROGEN bonded molecular solid.
Discussion
48.

Among the following which is strongest field ligand?

Answer»

CO
`CN^(-)`
`NH_(3)`
en.

Answer :A
Discussion
49.

Among the following, which is not the pi- bonded organomentallic compound

Answer»

`(CH_3)_4Sn`
`K[PtCl]_3(eta^2-C_2H_6)`
`FE(eta^5-C_5H_5)_2`
`CR(eta^6 - C_6H_6)_2`

ANSWER :A
Discussion
50.

Among the following which is most stable? Choose the correct code

Answer»

`1-X, 2-T, 3-Q`
`1-X, 2-S, 3-Q`
`1-X, 2-S, 3P`
`1-Y, 2-T. 3-Q`

Solution :Higher the CHARGE on the metal greater the STABILITY. 6 coordinate COMPLEXES are more STABLE than four coordinated one.
Discussion