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.

Which of the following is an example of a metal?

Answer»

BENZENE, Toluene
Cyclopropane, Cyclobuane
Pyridine, Pyrrole
Propane, Butane

Answer :A
Discussion
2.

Which bond is stronger between single bond of C-C of alkane and double bond C=C of alkene ?

Answer»

SOLUTION :C=C of alkene is strong because it has BOND ENTHALPY of `681 KJ mol^(-1)`
Discussion
3.

Which of the following does not show electrical conduction ?

Answer»

Potassium
Graphite
DIAMOND
Sodium

Solution :Diamond does not SHOW ELECTRIC CONDUCTANCE.
Discussion
4.

Thermite' is a mixture of X parts of ferric oxide and Y parts of aluminium powder. X, Y respectively are

Answer»

3,1
3,2
1,1
2,3

Solution :THERMITE is a mixture of 3 parts of ferric OXIDE and 1 PART of aluminium POWDER.
Discussion
5.

The work function (phi) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls metal is one the {:("Metal",Li,Na,K,Mg,Cu,Ag,Fe,Pt,W),(phi eV,2.4,2.3,2.2,3.7,4.8,4.3,4.7,6.3,4.75):}

Answer»

3
4
5
6

Answer :B
Discussion
6.

Which of the following pairs are tautomers ?

Answer»

`CH_3CH_2CHO " and" CH_3COCH_3`
`CH_3CHO " and " CH_2 =CHOH`
`C_2H_5COC_2H_5 " and " CH_3 COC_3H_7`
`CH_3-CH=CH-CH_3 " and " CH-3CH_2CH=CH_2`

Solution :
More delocalisation, more DISPERSAL of CHARGE and more STABILITY
Discussion
7.

To what stable isotope ""_(103)^(257)Lw decay after having been produced by artificial means ?

Answer»

`""_(83)^(209)Bi`
`""_(82)^(208)Pb`
`""_(82)^(206)Pb`
`""_(82)^(207)Pb`

Solution :`""_(103)^(257)Lw` is a member 4n+1 series, so it WOULD PROBABLY decay to `""_(89)^(209)Bi`
Discussion
8.

Which of the following mechanism is followed in the halogenation of alkanes in the presence of U-V light?

Answer»

Nucleophilie SUBSTITUTION
ELECTROPHILIC addition
Free RADICAL substitution
imination REACTION

SOLUTION :Free radical substitution
Discussion
9.

Which of the following oxides shows electrical properties like metals ?

Answer»

`SiO_(2)`
MGO
`SO_(2)` (S)
`CrO_(2)`

ANSWER :C
Discussion
10.

Which is the correct Lewis structure of Helium?

Answer»

`overset(.)He.`
`overset(..)He.`
`underset(..)overset(..)He`
`overset(..)He`

SOLUTION :HELIUM has only two electrons in its valence shell which is represented as a pair of DOTS (DUPLET).
Discussion
11.

Whatis emissionspectrum ?

Answer»

SOLUTION :Whenelectronabsorb the highand combackfromhigherenergylevelto aroundstatethanemitsradiation.It iscalledemission SPECTRA .
Discussion
12.

When Deltan_(g) is negative in chemical equilibrium reaction then :

Answer»

`K_(p)ltK_(p)`
`K_(p)=1//K_(c)`
`K_(p)=K_(c)(RT)^(-ve)`
`K_(p)gtK_(p)`

ANSWER :C
Discussion
13.

Which of the following statements regarding the resonance energy of benzene is correct ?

Answer»

It is the energy required to break the C-H bond in benzene
It is the energy required to break the C-C bond in benzene
It is a measure of STABILITY of benzene
It is the energy required to convert

Solution :RESONANCE energy` prop` stability of MOLECULE
Discussion
14.

Write the structures of the monomers of the following polymers: (i) Natural rubber (ii) Synthetic rubber(Buna-S) (iii) Nylon-6,6 (iv) Polythene (v) PVC (vi) Teflon (viii) Bakelite (ix) Polyropylene (x) Neoprene (x) Neoprene (xi) Plexiglass (xii) Buna-N

Answer»

Solution :
(iii) Hexamethylene diamine `[H_(2)N(CH_(2))_(6)NH_(2)]` and adipic ACID `[HOOC(CH_(2))_(4)COOH]`
(iv) Ethylene `(H_(2)C=CH_(2))`
(v) VINYL chloride `(H_(2)C=CHCl)`
(vi) Tetrafluoro ethylene `(F_(2)C=CF_(2))`
(vii) Ethylene glycol `(HOCH_(2)-CH_(2)OH)` and phthalic acid
(viii) PHENOL and formaldehyde
(ix) Propylene `(CH_(3)CH=CH_(2))`
(x) Chloroprene `(H_(2)C=overset(CL)overset(|)(C )-CH=CH_(2))`
(xi) Methyl methylacrylate `(H_(2)C=overset(CH_(3))overset("|")("C")-COOCH_(3))`
(xii) 1,3-Butadine and acrylonitrile `(H_(2)C=CH-CN)`
Discussion
15.

Which of the following is the correct order of stability of free radicals ?

Answer»

benzyl `GT` ALLYL `gt 2^(UNDERSET(-)o) gt 1^(underset(-)o)`
allyl `gt` benzyl `gt 2^(underset(-)o) gt 1^(underset(-)o)`
allyl `gt 2^(underset(-)o) gt 1^(underset(-)o)` benzyl
benzyl `gt 2^(underset(-)o) gt 1^(underset(-)o)` allyl

Answer :A
Discussion
16.

Which of the following statements correct ?

Answer»

Fullerenes have dangling bonds
Fullerenes are cage-like MOLECULES
Graphite is thermodynamically most stable allotrope of carbon
Graphite is slippery and hard and THEREFORE used as a dry lubricant in machines

Solution :Fullerenes are cage like molecules. C-60 molecule has the shape like a SOCCERBALL and called Buckminsterfullerenes. Graphite is thermodynamically most stable allotrope of carbon and therefore, `Delta_f H^ɵ` of graphite is taken as zero. `Delta_f H^ɵ` values of DIAMOND and fullerene, C-60 are 1.90 and 38.1 kJ `"mol"^(-1)`, respectively.
Discussion
17.

Which of the following property does not support anomalous behaviour of boron?

Answer»

Small size
High electronegativity
High ionization energy
Formation of TRIHALIDES

Solution :All the members of the BORON family FORM trihalides.
Discussion
18.

The total amount of oxygen consumed by microorganisms in decomposing the waste present in a certain volume of sample of water is called __________ of water.

Answer»


ANSWER :BIOCHEMICAL OxygenDemand (BOD)
Discussion
19.

Which of the following compounds will give same major product on acid catalysed hydration ?

Answer»

`Ph-undersetunderset(CH)(|)oversetoverset(CH)(|)C-CH=CH`
`Ph-oversetoverset(CH)(|)CH-undersetunderset(CH)(|)C=CH`

ANSWER :A::B::C::D
Discussion
20.

Which of the following is a lyophillic colloid?

Answer»

Milk
Gum
Fog
Blood.

Answer :B
Discussion
21.

Write IUPAC names of the following compounds

Answer»

SOLUTION :
Discussion
22.

What are elimination reaction? Give an example.

Answer»

SOLUTION :In these reactions, TWO atoms or groups are removed from a MOLECULE without being substituted by other atoms or groups.A new `C-C` DOUBLE bond is formed between the carbon atoms to which are eliminated atoms or groups are previously attached.It is ALWAYS accompanied with change in hybridization.
Example :`CH_(3) - underset"(Bromopropane)" (CH_(2)-CH_(2)) - CH_(2) - Br overset"(alc.KOH)"to underset "(Propene)"(CH_(3) -CH) = CH_(2) + KBr + H_(2)O`
Discussion
23.

Which mixture is known as producer gas ?

Answer»

`O_2+N_2`
`CO+H_2`
`CO+H_2O`
`CO+N_2`

ANSWER :D
Discussion
24.

Which of the following metals is present in chlorophyll ?

Answer»

MG
Be
Ca
none of these.

Solution :Mg
Discussion
25.

Which of the following is/are correct about the solubility ?

Answer»

Solubility of `CaF_2 ` is more in buffer solution of pH = 3 than in pure water
Solubility of ZnS in water depends upon the pH of solution
Solubility of AgCl increases in the presence of sodium THIOSULPHATE
Solubility of ZnS in the presence of `H^(+) ` ion can be derived by `K= ([Zn^(2+) ][H_2S])/([H^(+) ]^(2)) `where K is EQUILIBRIUM constant for the reactions `ZnS_(s) +2H _(aq) ^(+) hArr Zn_((aq) )^(2+) +H_2S_((aq))`

Solution :In acid solution`F^(-)` is removed
(b) ` S^(2-)` reacts with ` H^(+) `
( C )` Zns hArr 2n^(+2) + S^(2-), KSP `
` (H_2S hArr 2H^(+)+S^(2-) ,Ka)/( Zns +2H^(+)hArr Zn^(+2)+H_2S, K =(Ksp)/(Ka))`
Discussion
26.

What is the most important application of de Broglie concept ?

Answer»

SOLUTION :In the CONSTRUCTION of ELECTRON MICROSCOPE used for the MEASUREMENT of objects of very small size.
Discussion
27.

Which of the following statement is incorrect regarding the structure of borax?

Answer»

NUMBER of B - B bonds are zero
Hybridisation of each boron atom is `sp^(2)`
Number of `B-O-B` bonds are five
TWO of the boron atoms are TRIANGULAR planar and rest two are having tetrahedral geometry

Answer :B
Discussion
28.

What type of stoichiometric defect is show by : ( i) ZnS (ii) AgBr ?

Answer»

Solution : (i) ZNS SHOWS Frenkel defect because its have a LARGE difference in size.
(ii)AgBr shows both frenkel and SCHOTTKY defects.
Discussion
29.

Write the IUPAC names of the compound: CH_3CH = C(CH_3)_2

Answer»

SOLUTION :
Discussion
30.

While suphurdioxide and hydrogen peroxide can act as an oxidising as well as reducing agents in their reaction ozone and nitric acid act onlyu as oxidant why?

Answer»

Solution :`H_(2)O` are produced during the PROCESS
(B)the purpose of writing `O_(2)` two times suggest that `O_(2)` is being obtained from each of the two reactant
the path of reaction (a) and (b) can be DETERMINED by using `H_(2)O` or `D_(2)^(O)` in reaction (a) or by using `H_(2)O_(2)^(18)` or `O_(3)^(18)`in REACTOIN (b)
Discussion
31.

Write the resonating structures for the following molecules. Benzene

Answer»

SOLUTION :
Discussion
32.

Which are produce during high temperature combustion processes ?

Answer»

OXIDES of hydrogen
Oxides of sulphere
Oxides of carbon
Oxides of nitrogen

Answer :d
Discussion
33.

Which one is not a mineral of sodium ?

Answer»

ROCK salt
Chile SALTPETRE
Cyrolite
Petalite.

Solution :Petalite is a MINERAL of LITHIUM.
Discussion
34.

The systematic name of PhCH_(2)COOH is

Answer»

benzeneacetic ACID
phenylmethyl CARBOXYLIC acid
2-phenylmethanoic acid
2-phenylethanoic acid

ANSWER :D
Discussion
35.

Which of the following sequence is best suited to convert benzene to 3-chloro aniline?

Answer»

NITRATION, REDUCTION, CHLORINATION
chlorination, nitration, reduction
nitration, chlorination, reduction
nitration, reduction, ACETYLATION, chlorination, hydrolysis

Solution :N//A
Discussion
36.

What happens to the internal energy of the system if : (a) Works is done on the system (b) Work is done by the system.

Answer»

SOLUTION :(a) If work is DONE on the system INTERNAL energy will increase. (b) If work is done by the system, internal energy will decrease.
Discussion
37.

The reductive ozonolysis of an alkene gives a mixture of acetone and formaldehyde. What is the structural formula of the alkene?

Answer»

SOLUTION :
Discussion
38.

Which of the following alcohols will give iodoform test?

Answer»

Methanol
1-Butanol
1-Propanol
2-Butanol

Answer :D
Discussion
39.

Whichpairis truefromthe following ?

Answer»

AUFBAU(i) MVR
ANGULAR
Orientation ofelectroninorbital
Hunds rule(III)energyorder of orbitals

ANSWER :A
Discussion
40.

What is conjugate acid and conjugate base ? Give example.

Answer»

Solution :In CONJUGATE acid one PROTEN is more

In conjugate acid one H and the charge is more upto +1 unit.
In conjugate BASE one proten is LESS

In conjugate base one H and the charge is less upto +1 unit.
Discussion
41.

Which of the following does not give allyl halide as major product ?

Answer»

`CH_2 = CH - CH_3 UNDERSET(HV)overset(SO_2Cl_2)to `
`CH_2 = CH- CH_3 underset(800 K)overset(Cl_2) to `
`CH_2 = CH - CH_3 underset(hv)underset(NBS)to `
`CH_2 = CH - CH_3 + HBr overset(H_2O_2)`

Solution :`underset(Br)underset(|)CH_2 - CH_2 -CH_3`
Discussion
42.

Total number of orbitals associated with third shell will be...

Answer»

2
4
9
3

Solution :No. of ORBITALS in 3RD SHELL `(n =3) = n^(2) = 3^(2) = 9`
Discussion
43.

When the temperature of a reversible rection is increased from 327 to 427^(@)C, the equilibrium constant K_(p) is decreased by four times. Find the enthalpy of the reaction in this temperature range.

Answer»

Solution :`"log"((K_(p))_(2))/((K_(p))_(1))=(DELTAH^(@))/(2.303R)[(T_(2)-T_(1))/(T_(1)*T_(2))]`
`"log"1/4=(DeltaH^(@))/(2.3xx8.3)[(700-600)/(600xx700)]`
`-0.6201=(DeltaH^(@))/19.09xx100/420000`
`thereforeDeltaH^(@)=-(0.6201xx19.09xx420000)/100`
= -49734 J
= -49.734 kJ
Discussion
44.

Which of the following reaction is a redox reaction ?

Answer»

`4H_(3)PO_(4)+H^(+)toPH_(4)^(+)+3H_(2)PO_(3)`
`HSO_(4)^(-)+H_(2)OtoH_(3)O^(+)+SO_(4)^(2-)`
`H_(2)SO_(3)+2H_(2)Sto3S+3H_(2)O`
`HClO_(4)+P_(2)O_(5)toH_(3)PO_(4)+Cl_(2)O_(7)`

Solution :
Discussion
45.

Which of the following cannot be considered as a step of mechanism in chain reaction of methane with Cl_2 ?

Answer»

`Cl_2 to CL^(**)`
`CH_4+Cl^(**)to CH_3Cl + H^(**)`
`Cl^(**)+CH_4 to CH_3^(**)+HCL`
`Cl^(**)+CH_3^(**)to CH_3Cl`

ANSWER :B
Discussion
46.

Which one of the following is a primary standard ?

Answer»

`KMnO_(4) `
`CuSO_(4). 5H_(2)O`
`I_(2)`
`H_(2)SO_(4)`

Solution :N//A
Discussion
47.

Whichmetalplaysan importantroleinneuromuscularfunctions, internuronaltransimission cellmembraneintegrityandbloodcoagulation?

Answer»

`Be `
`MG`
`CA`
`BA`

ANSWER :C
Discussion
48.

Which of the following structure is similar to graphite ?

Answer»

BN
B
`B_(4)C`
`B_(4)H_(6)`

Solution :BN is a cubic & hexagonal structure it contains B -N - B and and N - B – N bonds with `109^(@)` bond ANGLE
Discussion
49.

Which of the followng act both as oxidising as well as reducing agents ?

Answer»

`HNO_(2)`
`H_(2)O_(2)`
`H_(2)S`
`SO_(2)`

Solution :`H_(2)S` acts only as a REDUCING agent while all other act both as OXIDISING as well as reducing AGENTS
Discussion
50.

Which one of the following binary liquid mixtures exhibits positive deviation from Raoults law ?

Answer»

ACETONE + CHLOROFORM
WATER + nitric ACID
HCl + water
ethanol + water

Solution :ethanol+water
Discussion