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 mixtures dipole-dipole as the major interaction is present in

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BENZENE and `CCl_4`
Benzene and ` C_2 H_5OH`
` CH_3COCH_3 and CH_3 CN`
KCL and water

Answer :C
Discussion
2.

Among the following ions, for which one standard enthalpy of ionisation is zero

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`OH _((AQ)) ^(-) `
`CL _((aq)) ^(-) `
`H _((aq)) ^(-) `
`H _((aq)) ^(+)`

ANSWER :D
Discussion
3.

Among the following ion the one that cannot undergo disproportionation

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

ANSWER :D
Discussion
4.

Among the following intermediates, which is/are electron deficient

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Carbocation
Nitrene
Carbene
Free radical

Solution :All the GIVEN SPECIES are ELECTRON defitient.
Discussion
5.

Among the following , identify the species with an atom in +6 oxidaiton state of metal

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`MnO_(4)^(-)`
`Cr(CN)_(6)^(3-)`
`NiF_(6)^(2-)`
`CrO_(2)CI_(2)`

Solution :oxidation of stte of Cr is +6
`(Cr_(2))O_(7))^(2-)+14H^(+)+6E^(-)rarr2Cr^(3+)+7H_(2)O`
Equivalent MASS of `K_(2)Cr_(2)O_(7)`=(Molecular)/(6)mass`
Discussion
6.

Among the following , identify the species with an atom in + 6 oxidation state

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`MnO_(4)^(-)`
`CR(CN)_6^(3-)`
`NiF_(6)^(2-)`
`CrO_(2) Cl_2`

Solution :`CrO_(2)Cl_2 , x - 4 -2 =0, x = +6`
Discussion
7.

Among the following how many of them is/are more stable than CH_(3)-CH-CH_(3)

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Solution :B, c, F, h (more STABLE)
Discussion
8.

Among the following hydroxides, the one which has the lowest value of K_(sp) at ordinary temperature (about 25^(@) C ) is

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`Mg(OH)_(2)`
`CA(OH)_(2)`
`Ba(OH)_(2)`
`Be(OH)_(2)`

Solution :The solubility increases down the group due to increase in size of the ION and DECREASE in LATTICE energy. Lower the solubility, lower is the `K_(sp)`.
Discussion
9.

Among the following, how many compound(s) destroy nitrite in the solution and does not form even traces of nitrate? AgNO_(3),NH_(4)CI,(NH_(2)CONH_(2)+dil.HCI_, sulphamic acid, (thiourea +dil. CH_(3)COOH),(FeSO_(4)+ dil CH_(3)COOH)

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SOLUTION :Sulphamic ACID
Discussion
10.

Among the following how many compounds are ahowing both reactivity with LiAlH_(4)&Aldol condensation & I_(2)//NaoH?

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SOLUTION :compounds 1,5,7 will follows the REDUCTION of `LiAlH_(4)` and ALDOL CONDUCTION andIodolform reaction
Discussion
11.

Among the following how many are possibly 'A'? AgNO_(3),BaCI_(2),Pb(OAc)_(2),HgCI_(2),CaCI_(2),CuSO_(4),FeCI_(3).

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Solution :`AgNO_(3),Pb(OAC)_(2),HgCI_(2),CuSO_(4)`
Discussion
12.

Among the following how many are pollutants ? Carbonmonoxide, nitric oxide, sulphur dioxide, mercury vapour.

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ANSWER :4
Discussion
13.

Among the following herbicide is

Answer»

DDT
ALDRIN
DIELDRIN
`Na_3AsO_3`

SOLUTION :`Na_3 AsO_3`
Discussion
14.

Among the following groups of oxides, the group that cannot be reduced by carbon to give the respective metals.

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`Cu_(2)O, Sn_(2)O`
`Fe_(2)O_(3)`, ZnO
CuO, `K_(2)O`
PbO , `Fe_(3)O_(4)`

Solution :Oxides of highly reactive metals are not reduced by carbon.
Discussion
15.

Among the following groupings which represents the collection of isoelectronic species ?

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`NO^(+), C_(2)^(2-), O_(2)^(-), CO`
`N_(2), C_(2)^(-2), CO, NO`
`CO, NO^(+), CN^(-), C_(2)^(2)`
`NO, CN^(-), N_(2), O_(2)^(-)`

ANSWER :C
Discussion
16.

Among the following gases, for how many gases, the compressibility factor is greater than unity at any pressure. H_2, He, SO_2, CO_2, CH_4, N_2, C_2H_6 O_2

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SOLUTION :`H_2 , He , Z > 1`.
Discussion
17.

Among the following gaseous elements with atomic numbers, which will have greater rate of diffusion?

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Z = 7
Z = 8
Z = 10
Z = 17

SOLUTION :`Z = 7 IMPLIES N_2, M.Wt = 28`
`Z = 8 implies O_2, M.Wt = 32`
`Z = 10 implies N e, M.Wt = 20`
`Z = 17 implies Cl_2 , M.Wt = 71`.
Discussion
18.

Among the following free radical bromination reactions, select those in which 2^(@) halide is the major product-

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<P>P, Q, R, S
P, R, U
P, R, S, T
P, Q, R, S, T

Solution :Bromine is more selective `:.` it will form `3^(@)` HALIDE if there is presence of `3^(@)` HYDROGEN. `:.` Q, S, T form `3^(@)` halide as MAJOR and P, R, U form `2^(@)` halide as major.
Discussion
19.

Among the following four structures, one is not a permissible resonance form. Identify the wrong structure.

Answer»

`overset(+)(C)H_(2)-overset(..)underset(" "CH_(3))underset(|)(N)-overset(-)overset(..)underset(..)O:`
`CH_(2)-overset(+)underset(" "CH_(3))underset(|)(N)-overset(-)ddotunderset(..)O:`
`CH_(2)-underset(CH_(3))underset(|)(N)=underset(..)O:`
`:overset(-)(C)H_(2)-overset(+)underset(CH_(3))underset(|)(N)=underset(..)O:`

Answer :C
Discussion
20.

Among the following find the total number of incorrect statement(s): (a) BO_(3)^(3-),PO_(4)^(3-),F^(-) and SiO_(4)^(4-) anions are called as interfering radicals. (b) HgCI_(2) reacts with carbonate ion and gives basic mercury (II) carbonate which does not give test with bicarbonate. (c) SO_(3)^(2-) and HSO_(3)^(-) can be distinguished by addition of neutral H_(2)O_(2) solution aganist litmus paper. (d) Zinc and sulphuric acid oxidizes sulphite to sulphate. (e) AgNO_(3) oxidizes suspension of sulphite solution to sulphate. (f) Bromine water oxidizes BaSO_(3) to BaSO_(4).

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SOLUTION :(d) and (E) are INCORRECT.
Discussion
21.

Among the following, find.the number of correct statements? Sea water and trees are big sinks for carbondioxide. Geater the chemical oxygen demand (COD) and biochemical oxygen demand (BOD) values, greater is the extent of pollution. Lesser the threshold limit value (TLV), greater the toxicity Ozone layer present in stratosphere acts as protective umbrella form hamful sunrays. Flouride ion in drinking water is detected by using zirconium alizarin - S dye. The dye loses its colour in the presence of flouride. Human ear can tolerate the sound upto the intensity 60 decibles.

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ANSWER :6
Discussion
22.

Among the following statements the correct are :

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Neutralisation, salt hydrolysis, precipitate FORMATION, complex formation involve generally no electron TRANSFER.
Reductant provides electron or electrons and an oxidant accepts electron (or) electons
Oxidant is reduced by accepting elecctrons and reductant is oxidised by LOSING electrons.
The ions which do not undergo any electronic change during a chemical reaction are termed as spectator ions.

SOLUTION :All the statements are correct .
Discussion
23.

Among the following fin out the total number of black metal sulphides. CuS, NiS, CoS, ZnS, CdS

Answer»


SOLUTION :`CUS, NIS, COS`
Discussion
24.

Among the following elements, which has the least electron affinity?

Answer»

PHOSPHOROUS
OXYGEN
SULPHUR
Nitrogen

Answer :D
Discussion
25.

Among the following elements, what is the total number of elements having the lowest oxidation state of zero? Ta b. Te c. Tc d. Ti e. TI

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Solution :The MAXIMUM oxidation state is the group NUMBER. The maximum oxidation state of METALS is ZERO, for non-metal it is equal to the group number minus `8`. The maximum and the minimum oxidation states are
a. `+5`, b. `+6, -2` , c. `+7 , 0` , d. `+4,0` , e. `+3, 0`
Discussion
26.

Among the following elements most acidic oxide is given by

Answer»

AI 
P 
N 
Sb 

Answer :C
Discussion
27.

Among the following electronic configurations, which one is correct?

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ANSWER :C
Discussion
28.

Among the following element is metalloit.

Answer»

C
S
GE
Pb

Solution :Ge is a AMPHOTERIC ELEMENT
Discussion
29.

Among the followng degenerate orbitals are

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`SIGMA1S , sigma1s^(**)`
` sigma2px , sigma 2px^(**)`
`PI 2p_x, pi2p_y`
`pi 2 PY , pi2pz^(**)`

Answer :C
Discussion
30.

Among the following correct order is/are

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STABILITY : LII `lt` NaI `lt` KI `lt`RBI `lt` CsI
Stability : LiF `gt` NaF `gt` KF `gt` RbF `gt` CsF
Melting point : NaF` gt` NaCl `gt` NaBr `gt` NaI
Stability : NaF `gt` NaCl `gt` NaBr `gt` NaI

Answer :A::B::C::D
Discussion
31.

Among the following compounds which does not have more than one type of hybridisation for carbon atoms?

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

ANSWER :A
Discussion
32.

Among the following compounds whichcan be dehydrated very easily :

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ANSWER :C
Discussion
33.

Among the following compounds viscosity is highest for

Answer»

Methanol
Propane-1,2,3 TRIOL 
Ethyleneglycol
Ethanol

Solution :More H - BONDS `IMPLIES` more `ETA`.
Discussion
34.

Among the following compounds, the strongest acid is

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`HC^(@)CH`
`C_(6)H_(6)`
`C_(2)H_(6)`
`CH_(3)OH`

ANSWER :D
Discussion
35.

Among the following compounds, the strongest acid is:

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ANSWER :A
Discussion
36.

Among the following compounds, the one with greatest ionic character is

Answer»

NaCl
KCl
CsCl
RbCl

Answer :C
Discussion
37.

Among the following compounds the one that is most reactive towards electrophilic nitration is

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BENZOIC acid
Nitrobenzene
Toluene
Benzene

Answer :C
Discussion
38.

Among the following compounds, the one which does not show ket-enol tautomerism is :

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ANSWER :B
Discussion
39.

Among the following compounds, the one that is most reactive towards electrophilic nitration is

Answer»

BENZOIC ACID
nitrobenzene
toluene
benzene

Solution :Toluene has electron-donating methyl group (while others have electron-withdrawing groups) and hence most reactive towards ELECTROPHILIC NITRATION.
Discussion
40.

Among the following compounds the one that is most reaction towards electrophilic niration is

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TOLUENE
Benzene
BENZOIC acid
NITROBENZENE

Solution :N/A
Discussion
41.

Among the following compounds , the one that gets hydrolysed to form metallic hydroxide , hydrogen peroxide and oxygen is

Answer»

`Na_(2)O`
`Na_(2)O_(2)`
`Li_(2)O`
`Li_(2)O_(2)`

Solution :SUPEROXIDES on hydrolysis give METAL hydroxide ,
`H_(2)O_(2)` and `O_(2)`
`2KO_(2) + 2H_(2)O to 2 KOH + H_(2)O_(2) + O_(2)`
Discussion
42.

Among the following compounds, the most acidic is

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p-nitrophenol
p-hydroxybenzoic acid
o-hydroxybenzoic acid
p-toluic acid

Solution :ORTHO EFFECT.
Discussion
43.

Among the following compounds, the most acidic is :

Answer»

p-nitrophenol
p-hydroxybenzoic acid
o-hydroxybenzoic acid
p-toluic acid

Answer :C
Discussion
44.

Among the following compounds, the increasing order of their basic strength is :

Answer»

`(I) glt (II) LT (III) lt (IV)`
`(I) lt (II) lt (IV) lt (III)`
`(II) lt (I) lt (III) lt (IV)`
`(II) lt (I( lt (IV) lt (III)`

Answer :D
Discussion
45.

Among the following compounds, strongest acid is

Answer»

`CH-=HC`
`C_(6)H_(6)`
`C_(2)H_(6)`
`CH_(3)OH`

Solution :`B(C_(6)H_(6))` and `C(C_(2)H_(6))` are hydrocarbonsand as such are very weak acids. `A(HC -= CH)` is less ACIDIC than `D(CH_(3)OH)` as D can displace a from its salt.
`HC-=UNDERSET((D))(bar(C))overset(+)(Na)+CH_(3)OH rarrCH -=underset((A))(CH)+CH_(3)ONa`
Discussion
46.

The order of reactivity of following towards electrophilic substitution is

Answer»

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

Solution :REACTIVITY towards ELECTROPHILIC SUBSTITUTION decreases as the electron density in the benzene ring decreases.
Discussion
47.

Among the following compounds, o-dichloro benzene and p-dichloro benzene, which has higher melting point ? Explain with reason. (ii) Write notes on the adverse effect caused by ozone depletion.

Answer»

Solution :The melting point of p-dichloro benzene is higher than the melting point of the corresponding ortho and meta isomers. The higher melting which leads to more close packing of its moleules in the crystal lattice and consequently strong intermolecular attractive forces which REQUIRES more energy for melting. p-dichlorobenzene >o-dichlorobenzene > m-dichlorobenzene (ii) 1. The formation and destruction of ozone is a regular natural process, which never disturbs the equilibrium level of ozone in the stratosphere. Any change in the equilibrium level of ozone in the atmosphere will adversely affect the LIFE in biosphere in the following ways. 2. Depletion of ozone layer will allow more UV rays to reach the earth surface and would cause skin cancer and ALSO decreases the immunity level in human BEINGS. 3. UV radiations affects plant proteins which lead to harmful mutation in plant cells. 4. UV radiations affect the growth of phytoplankton and as a RESULT ocean food chain is disturbed and it even damages the fish productivity.
Discussion
48.

Among the following compounds of cement which is present in the highest amount ?

Answer»

`Ca_(2)SiO_(4)`
`Ca_(3) SiO_(5)`
`Al_(2)O_(3)`
`Ca_(3)Al_(2)O_(6)`

Solution :`Ca_(3) SiO_(5) `(51%)
Discussion
49.

Among the following compounds, most acidic is

Answer»

`p-`NITROPHENOL
`p-`hydroxybenzoic ACID
`o-`hydroxybenzoic acid
`p-`TOLUIC acid

Solution :Due to ORTHO effect, `o-` hyroxybenzocacid is the strongest acid
Discussion
50.

Among the following compounds insoluble in water is/are: PbI_(2),HgI_(2),Hg_(2)OCI_(2),NaCI,KI,AgCI

Answer»


Solution :`PbI_(2),HgI_(2),Hg_(2)OCI_(2),AgCI`
Discussion