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 following, thc true property about is

Answer»

non-planar
`C^(+)` is `SP^(2)` hybridized
elcctrophile can ATTACK `C^(+)`
does not undergo hydrolysis

Solution :`C^(+)` in carbocations is always`sp^(2)` - hybridized.
Discussion
2.

Among the following the achiral amino add is

Answer»

2-ethylalanine
2-methylglycine
2-hydroxymethylserine
Tryptophan

Solution :2-hydroxymethylserine
Discussion
3.

Among the following, surfactant that will form miceles in aqueous solution at the lowest molar concentration at ambient conditions is

Answer»

`(CH_(3))(CH_(2))_(15)N^(+)(CH_(3))_(3)Br^(-)`
`CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)`
`CH_(3)(CH_(2))_(6)COO^(-)Na^(+)`
`CH_(3)(CH_(2))_(11)N^(+)(CH_(3))_(3)Br^(-)`

Solution :LONGER the CARBON chain, i.e., greater is the size of the hydrophobic chain (tail), less is the solubility in water and greater is the tendency of surfactant molecules to asscoated to form micelle, i.e., lower is the cmc. HENCE (a) with the longest. carbon chain has the LOWEST cmc. [In fact, log (cmc) =A -B (C#)]
Discussion
4.

Among the following substituted silanes, the one which will.give rise to cross-linked silicone polymer on hydrolysis is-

Answer»

`R_3 SICL`
`R_4Si`
`RSiCl_3`
`R_2SiCl_3`

ANSWER :C
Discussion
5.

Among the following structures the one which is not a resonating structure of others is

Answer»

I
II
III
IV

Solution :

because it has VIOLATED the basic RULE for resonance. Here, one HYDROGEN has been removed, this is NEVER possible as in resonance, no. of ATOMS and position of atoms never change.
Discussion
6.

Among the following substances, the lowest vapour pressure is exerted by :

Answer»

WATER
Mercury
Kerosene
Rectified SPIRIT

ANSWER :B
Discussion
7.

Among the following structures, the one which is not a resonating structure of others is :

Answer»

I
II
III
IV

Solution :
Discussion
8.

Among the following strongest base is

Answer»

`LA (OH)_(3)`
`Ce(OH)_(3)`
`Lu (OH)_(3)`
`YB (OH)_(3)`

Answer :A
Discussion
9.

Among the following statements, which os INCORRECT ?

Answer»

`Cl_(2)` gas is dried by USING conc. `H_(2)SO_(4)` .
HF SHOWS hydrogen bonding.
Oxidising power of halogens follow the order `I_(1) gt Br_(2) gt Cl_(2)`.
HI is the strongest acid among HI, HBr,HCl.

Answer :C
Discussion
10.

Among the following statements which one is incorrect ?

Answer»

Nitrogen has the ability to form `p PI - p pi` bonds with itself.
Bismuth forms metallic bonds in elemental state.
CATENATION tendency is higher in nitrogen when compared with other ELEMENTS of the same group.
Nitrogen has higher FIRST ionization ENTHALPY when compared with other elements of the same group.

Solution :Phosphorus has the highest catenation tendency as compared to the other members of the group 15.
Discussion
11.

Among the following statements, which is true about boron compounds ?

Answer»

`BF_(3)rArr` LEAST ACIDIC among the boron HALIDES
`BF_(3)rArr` does not hydrolyses
`B_(2)H_(6)rArr` does not have banana bond
All are incorrect

Answer :A
Discussion
12.

Among the following statements, the incorrect one is

Answer»

Calamine and siderite are carbonates
Argentite and cuprite are oxides
Zinc BLENDE and PYRITES are sulphides
Malachite and azurite are ORES of copper

Solution :Argentite is a sulphide ORE.
Discussion
13.

Among the following statements the incorrect one is

Answer»

CALAMINE and siderite are carbonates
Argentite and CUPRITE are oxides
Zine blende and IRON pyrites are sulphides
Malachite and azurite are ores of copper

Answer :B
Discussion
14.

Among the following statements on the nitration of aromatic compounds, the incorrect one is

Answer»

The RATE of nitration of benzene is ALMOST the same as that of hexadeuterobenzene.
The rate of nitration of toluene is greater than that of benzene.
The rate of nitration of benzene is greater than that of hexadeuterobenzene.
Nitration is an ELECTROPHILIC SUBSTITUTION reaction.

Answer :C
Discussion
15.

Among the following statements the incorrect is/are :

Answer»

Ag, Mg and Al cannot be OBTAINED by electrolysis of the aqueous solution of their salts
In the aluminothermite PROCESS aluminium acts as an oxidizing agent
Chalcopyrite which contains Fe and CU
Pb and Cu both can be extracted by SELF reduction method

Answer :B::C
Discussion
16.

Among the following statements on the nitration of aromatic compounds , the false one is

Answer»

The rate of NITRATION of benzene is almost the same as that of hexadeutrobenzene
The rate of nitration of TOLUENE is greater than that of benzene
The rate of nitration of benzene is greater than that of hexadeuterobenzene
Nitration is an ELECTROPHILIC SUBSTITUTION reaction

Answer :C
Discussion
17.

Among the following statements about the molecules X, and Y, the one (s) which is (are ) correct is (are)

Answer»

X and Y are diastereomers
X and Y are ENANTIOMERS
X and Y are both aldohexoses
X is a D-sugar and Y is an L-sugar.

Solution :
They are mirror images of each other hence, are enantiomers. They are aldohexoses too (ALDEHYDE GROUP+ six CARBON).
Discussion
18.

Among the following statement which one is true ?

Answer»

`NH_(3)` is less SOLUBLE than `PH_(3)` in water
`NH_(3)` is stronger BASE and stronger reducing AGENT than `PH_(3)`
`NH_(3)` has higher boiling point than `PH_(3)` and has lower melting point than `PH_(3)`
`PH_(3)` is stronger reducing agnet than `NH_(3)` and it has lower critical TEMPERATURE than `NH_(3)`

ANSWER :4
Discussion
19.

Among the following statement the incorrect onr is (IIT -1997)

Answer»

CALAMINE and SIDERITE are carbonate
Argentite and cuprite are oxides
Zinc blande and PYRITES are sulphide
Malachite and AZURITE are ores of COPPER

Answer :b
Discussion
20.

Among the following species, identify the isostructural pairsNF_3, NO_3^-, BF_3, H_3O^+,

Answer»

`[NF_3, NO_3^-]`and, `[BF_3, H_3O]`
`[NF_3, HN_3]`and`[NO_3^(-)BF_3]`
`[NF_3,H_3O^+]`and `[NO_3^-, BF_3]`
`[NF_3,H_3O^+]`and`[BF_3, HN_3]`

ANSWER :C
Discussion
21.

Among the following species, how many are aromatic in nature?

Answer»

5
4
6
3

Answer :A
Discussion
22.

Among the followingslowest reaction under idetical conditions is

Answer»

`H^(+)+OH^(-) to H_(2)O`
`2KMnO_(4)+5H_(2)C_(2)O_(4)+3H_(2)SO_(4) to `
`K_(2)SO_(4)+10CO_(2)+2MnSO_(4)+8H_(2)O`
`2KMnO_(4)+10FeSO_(4)+8H_(2)SO_(4)rarr`
`K_(2)SO_(4)+2MnSO_(4)+5Fe_(2)(SO_(4))_(3)+8H_(2)O`
`AgNO_(3("aq"))+NaCl_(("aq")) to AgCl_((s))+NaNO_(3("aq"))`

Answer :B
Discussion
23.

Among the following sets of reaction which one produces anisole ?

Answer»

`CH_(3)CHO, RMgX`
`C_(6)H_(5)OH, NaOH, CH_(3)I`
`C_(6)H_(5)OH` neutral `FeCl_(3)`
`C_(6)H_(5)CH_(3), CH_(3)COCl, AlCl_(3)`

Solution :(A) `CH_(3)-underset(O)underset(||)CH=O+RMgX tounderset("Alcohol")( CH_(3)-overset(R)overset(|)CH-OH)`
(B) `C_(6)H_(5)-OH+NaOH to C_(6)H_(5)-ONA underset(SN^(2))overset(CH_(3)I)to C_(6)H_(5)-underset("(Anisole)")(OCH_(3))`
(C) `C_(6)H_(5)OH+ "NATURAL" FeCl_(3) to "Violet colour complex"`
(D) `C_(6)H_(5)CH_(3)+ CH_(3)COCl+ AlCl_(3) to "Para-methyl acetophenone"`
Discussion
24.

Among the following sets of reactants which one produces anisole

Answer»

`C_(6)H_(5)OH , ` neutral `FeCl_(3)`
`C_(6)H_(5)-CH_(3), CH_(3)COCl, AlCl_(3)`
`CH_(3)CHO, RMgX`
`C_(6)H_(5)OH,NAOH, CH_(3)I`

SOLUTION :
Discussion
25.

Among the following series of transition metal ions, the one where all metal ions have 3d^2 electronic configuration is (At. nos. Ti = 22, V = 23, Cr = 24, Mn = 25)

Answer»

`TI^(3+),V^(2+),Cr^(3+), MN^(4+)`
`Ti^(+),V^(4+),Cr^(6+), Mn^(7+)`
`Ti^(4+) ,V^(3+),Cr^(2+),Mn^(3+)`
`Ti^(2+),V^(3+),Cr^(4+),Mn^(5+)`

Answer :D
Discussion
26.

Among the following sets of reactants which one produces anisole?

Answer»

`CH_3CHO,RMGX`
`C_6H_5OH, NAOH,CH_3I`
`C_6H_5OH, ` NEUTRAL `FeCl_3`
`C_6H_5-CH_3,CH_3COCl,AlCl_3`

ANSWER :B
Discussion
27.

among the following series of transition metal ions, the one where all ions have some 3d electronic configuration is

Answer»

`TI^(2+),Cr^(4+), Mn^(5+),V^(3+) `
`Ti^(3+), Ni^(2+), Co^+, Zn^(2+)`
`Sc^(2+), Ti^(2+), V^(2+), Cr^(2+)`
`Mn^(5+), Co^(4+), Ni^(3+),Cu^(2+)`

Answer :A
Discussion
28.

Among the following , select the alcohol which reacts slowest with Lucas reagent

Answer»

2-methylpropan-2-ol
Butan-2-ol
Benzyl alcohol
Butan-1-ol

Solution :Lesser than STABILITY ofcarbocation, lesser will be the reactivity of corresponding alcohol TOWARDS LUCAS REAGENT .
Primary ACOHOL reacts slowly with lucas reagent
Discussion
29.

Among the following series of transition metal ions, how many metals ions have d^(2) electronic configuration Fe^(4+), V^(3+), Sn^(2+), Au^(3+)Ti^(2+), As^(3+), Cr^(3+), Mn^(5+)Co^(3+), Zr^(2+), Cd^(2+), Mo^(4+), La^(2+), Ta^(4+), Co^(6+), Ni^(4+)

Answer»


ANSWER :6
Discussion
30.

Among the following , select the pair that does not form an ideal solution

Answer»

CARBON TETRACHLORIDE and SILICON tetrachloride
Chlorobenzene and Bromobenzene
Chloroform and Carbon tetrachloride
Benzene and toluene

Answer :C
Discussion
31.

Among the following secondary allylic halide is

Answer»

3-bromo-2-methylbut-1-ene
4-bromo-3-methylbut-2-ene
3-bromo-2-methylpropene
1-bromobut-2-ene

Solution :
Discussion
32.

Among the following sedimentary rocks, which one is of organic origin ?

Answer»

Gypsum
Limestone
Nitre
Rock salt

Solution :Due to erosian of earth's crust caused by WATER, AIR and carbondioxide, the sedimentry materials (MUCH as clay, sand and mud) were produced. The materials deposited in rivers, lakes and OCEANS which results in the formation of sedimentary rocks such as lime stone CHALK and sand stone.
Discussion
33.

among the following representation of excited state of atoms, which one is impossible

Answer»

`3s^1 3p^1`
`[NE]3s^2 3p^6 4s^3 3d^2`
`1s^2 2s^2 2P^(7)3s^2`
`[Ne]3s^2p^3d^1`

ANSWER :B
Discussion
34.

Among the following salts, whose aqueous solutions will tum blue litmus paper red-

Answer»

`NaHCO_3`
`FeCl_3`
KCN
`C_6H_5N^(o+)H_3Cl^(-o)`

ANSWER :B::D
Discussion
35.

Among the following reaction(s) which gives (give) tert-butyl benzene as the major product(s)-

Answer»




SOLUTION :.
Discussion
36.

Among the following, reaction(s) which gives (give) tert-butyl benzene as the major product is(are)

Answer»




SOLUTION :Only tert-butyl bromide on presence of `NaOC_(2)H_(5)` undergoes dehydrohalogenation to get isobutylene

while all the remaining three reactions UNDERGO F.C. ALKYLATION to give tert-butylbenzene.

Discussion
37.

Among the following reaction which gives tert-butyl benzene as the major product is (are)

Answer»




SOLUTION :
Discussion
38.

Among the following reactions, which form salicylic acid (after acidification):-

Answer»




ANSWER :C
Discussion
39.

Among the following reactions , the fastest one is

Answer»

Burning of coal
Rusting of iron in moist air
Conversion of monoclinic sulphur to RHOMBIC sulphur
Precipitation of SILVER CHLORIDE by mixing of silver NITRATE and sodium chloride SOLUTION

Solution :It is a photochemical reaction .
Discussion
40.

Among the following reaction, the fastest one is

Answer»

BURNING of COAL
RUSTING of iron in MOIST air
conversion of monoclinic sulphur to RHOMBIC sulphur
Reaction between sodium nitrate and Hydrogen chloride solutions.

Solution :Ionic reactions are instanteneous.
Discussion
41.

Among the following reaction the fastest one is :

Answer»

BURNING of coal
Rusting of iron in moist car
Conversion of MONOCLINIC sulphur to rhombic
Precipitation of silver CHLORIDE by mixing silver NITRATE and SODIUM chloride solutions

Answer :D
Discussion
42.

Among the following psedo halogen

Answer»

`Cl_(2)`
`Cbar(N)`
`I_(3)^(-)`
`C_(2)N_(2)`

Solution :Covalent demers of pseudo haloide ions are pseudo HALOGENS.
Discussion
43.

Among the following psedo halide

Answer»

`Cl_(2)`
`Cbar(N)`
`I_(3)^(-)`
Cynogen

Solution :Uninegative groups CONSISTING of two or more E.N. atoms that SHOW properties similar to halid ions are PSEUDO halides.
Discussion
44.

Among the following perhaloalkane is

Answer»

`SCl_4`
`CHCl_3`
`C_2 Cl_6`
`CF_3 CHClBr`

ANSWER :C
Discussion
45.

Among the following polymers the strongest molecular forces are present in

Answer»

elastomers
fibres
thermoplastics
THERMOSETTING POLYMERS

Solution :Thermosetting polymers have STRONGEST MOLECULAR FORCES. These are crosslinked polymers
Discussion
46.

Among the following particles, which will have the shortest wavelength when accelerated by one million eV?

Answer»

Neutron
Tritium atom
`alpha`- PARTICLE
Electron

Solution :Wavelength is INVERSELY proportional to the MASS of teh particle `lamda=h/(MV)`
Since `alpha` particles have the largest mass (4 a.m.u. ), these will have SHORTEST wavelength.
Discussion
47.

Among the following pairs, the pairs that illustrates stereioisomerism is

Answer»

1-butanol and 2-butanol
Cis-2-butene and trans-2-butene
Dimethyl ETHER and ethanol
Acetone and propanal

Solution :
cis-2-butene and trans-2-butene are GEOMETRICAL ISOMERS.
Discussion
48.

Among the following pairs, the pair that illustrates stero isomerism is:

Answer»

1-butanol and 2-butanol
dimethyl ETHER and ethanol
acetone and propanal
ethanol and ETHANAL

ANSWER :C
Discussion
49.

Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other , in

Answer»

`Tl^(+),Tl^(3+)`
`Cu^(+),Cu^(2+)`
`Cr^(2+),Cr^(3+)`
`V^(2+), VO^(2+)`

Solution :`Tl^(+)`is more STABLE than `Tl^(3+)`due to invertpair effect ( Tl belongs to Group 13 and is the last element of the Group ).
Discussion
50.

Among the following pair of complexes, in which case the Delta_(0) value is higher for the first one?

Answer»

`[CO(NH_(3))_(6)]^(3+)" and "[Co(CN)_(6)]^(3-)`
`[CoF_(6)]^(3-)" and "[Co(NH_(3))_(6)]^(3+)`
`[Co(H_(2)O)_(6)]^(2+)" and "[Co(H_(2)O)_(6)]^(3+)`
`[Rh(H_(2)O)_(6)]^(3+)" and "[Co(H_(2)O)_(6)]^(3+)`

Solution :Down the GROUP, C.F. SPLITTING INCREASES `40-50%`.
Discussion