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.

Vander waal constant 'b' is very high for the following gas

Answer»

`Cl_2`
He
`O_2`
`CO_2`

ANSWER :A
Discussion
2.

Which of the following gas can be liquified very easily

Answer»

`O_(2) (T_(C) = 154.4 K)`
`C_(2) H_(2) (T_(C) = 308.6 K)`
`CH_(4) (T_(C) = 190.7 K)`
He `(T_(C) = 5.3 K)`

ANSWER :B
Discussion
3.

The species Ar, K^(+) " and " Ca^(2+) contain the same number of electrons. In which order do their radii increase ?

Answer»

`Ca^(2+) lt AR lt K^(+)`
`Ca^(2+) lt K^(+) lt Ar`
`K^(+) lt Ar lt Ca^(2+)`
`Ar lt K^(+) lt Ca^(2+)`

Solution :`Ca^(2+) lt K^(+) lt Ar`
`{:("Radius "alpha 1/(Z_("eff"))" for isoelectronic species "),(""Ca^(2+) ""K^(+) "Ar"),("Z201918"),(ul("No. of" BAR(E) "181818")),( leftarrow " Nuclear charge increses "leftarrow),(.:. to " Their redii increases" to ):}`
Discussion
4.

Which of the following contents are oxidise when they react with dihydrogen

Answer»

CALCIUM
SULPHUR
LITHIUM
Carbon

Solution :Hydrogen can act as oxidising AGENT when REACT with metals such as `Ca, Li, Na, K`-----
Discussion
5.

Using MO theory, predict which of the following species has the shortest bond length?

Answer»

`O_(2)^(2+)`
`O_(2)^(-)`
`O_(2)^(2-)`
`O_(2)^(+)`

SOLUTION :`O_(2)^(2+)`
Discussion
6.

Which of the two elements, carbonand silicon, formsmultiple bonds ?

Answer»

Solution :Due to SMALLER size and HIGHER electronegatively , carbon UNDERGOES `ppi- ppi`overlop to form multiple bonds but silicondoes not.
For EXAMPLE , `CO_(2)`has `C = O`doublebond but `SiO_(2)` has only `Si-O` single bonds.
Discussion
7.

Which of the following is used in preparation of artifical flavours :

Answer»

LOWER alcohol
ester of lower FATTY acid
ester of HIGHER fatty acid
lower fatty acids

Solution :SEE ESTERS
Discussion
8.

Which of the following is redox reaction ?

Answer»

`NaOH_((aq))+HCl_((aq))toNaCl_((aq))+H_(2)O_((l))`
`CH_(3)COOH+CH_(3)OHtoCH_(3)COOCH_(3)+H_(2)O`
`H_(2)S_((aq))+3H_(2)SO_(4(aq))to4SO_(2(g))+4H_(2)O_((l))`
`K_(2)SO_(4(aq))+BaCl_(2(aq))to2KCl_((aq))+BaSO_(4(s))`

SOLUTION :
Discussion
9.

What happens whensodium metal is heated in free supply of air ?

Answer»

Solution :On being HEATED in air, sodium reacts VIGOROUSLY with OXYGEN to FORM sodium peroxide. The chemical equation involved in the reaction is :
`2Na_((g))+O_(2(g)) to Na_(2)O_(2(g))`
Discussion
10.

Which one of the following is not prepared from halide by chemical oxidation process

Answer»

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

ANSWER :A
Discussion
11.

What is the maximum number of electrons which can be accommodated in an atom in which the highest principal quantum number is 4 ?

Answer»

10
18
36
54

Solution :Maximum n = 4 means we can fill upto `4p^(6)` because after that 5s starts. HENCE, complete E.C.
`= [Ar]^(18) 4S^(2) 3D^(10) 4p^(6)`. Total `e^(-) = 36`
Discussion
12.

The type ofhybridisation of boron is diborane is (a) sp, (b) sp^(2) , (c ) sp^(3), (d) dsp^(2)

Answer»

SOLUTION :In `B_(2)H_(6), B` is `SP^(3)`-hybridized. THEREFORE , option (C ) is correct.
Discussion
13.

Zero inductive effect is shown by

Answer»

`C_(6)H_(5)`
H
`CH_(3)`
Cl

Answer :B
Discussion
14.

What is the oxidation state of phosphorous element in cyclo meta phosphoric acid ?

Answer»

`+3`
`+5`
`-3`
`+2`

ANSWER :B
Discussion
15.

Whichare the drawbacksofRutherfordatomicmodel

Answer»

SOLUTION :Rutherfordmodelis thatnoinformationabout theelectronicstructureof ATOM can beobtained(II) i.ehowelectronsare distributedin anatom.Thenucleusand energypossessedby thenremainunknown.
Discussion
16.

What is the difference of dipole moment of NH_(3) and NF_(3) molecules ?

Answer»

Solution :The DIPOLE MOMENT of`NH_(3).(0.80 xx 10^(-30) " CM" )`is less than the dipole moment of `NH_(3) (4.90 xx 10^(-30) "Cm")`
Discussion
17.

Write Lewis Acid-Base principle.

Answer»

Solution :Defination : G.N. Lewis in 1923 defined an "acid as a species which accepts electron pair and base which donates an electron pair."
Comparison of Bronsted-Lowry and Lewis Base: As far as base are concerned, there is not much DIFFERENCE between Bronsted-Lowry and Lewis concept, as the has provides a lone pair in both the cases. The Lewis base `NH_3` donate electron pair to `H^+` and `NH_4^+` is farm. `NH_3` is act as base in both principle. All Lewis base will be Bronsted-Lowry base and Lewis base.
Comparison of Bronsted-Lowry and Lewis Acid : In Bronsted-Lowry acid must containing PROTON. HOWEVER, in Lewis concept many acids do not have proton. Electron deficient species like `BF_3 , AlCl_3 , FeCl_3 , NO_2^(+), Mg^(2+) , Co^(3+)`etc. can be act as Lewis acids. "Thus all Lewis acid not act as Bronsted-Lowry acid."
`UNDERSET"Lewis acid"(BF_3) + underset"Lewis base"( :NH_3) to F_3F: NH_3`
Species like `H_2O , NH_3 , OH^-` etc. which can donate a pair of ELECTRONS can act as Lewis bases.
Discussion
18.

Which of the following is correct for acid buiter? [salt = S, acid = A]

Answer»

` P^(K_4) =P^(H) +LOG""([S])/([A]) `
` P^(H) =P^(K_a)+log ""([S])/([A])`
` [H^(+) ]=10 ^(-P^(K_a) )`
` P^(H) =-log ""([S])/([A]) `

SOLUTION :Henderson.s EQUATION
Discussion
19.

What is the wavelengthof objecthaving0.1kg ? Whatit indicate ?

Answer»

Solution :`lambda = 6.626 xx 10^(34) m`it is veryshort.So itdoesnothave WAVE nature .
Discussion
20.

What is the half life period of tritium? How is it undergoes radioactive disintegration?

Answer»

Solution :(i) The HALF life of tritium = 12.33 years
(ii) Tritium is a beta-emitting radioactive ISOTOPE of HYDROGEN. `"_(1)^(3)Hto_(-1)^(0)e+_(2)^(3)He`
Discussion
21.

Which of the following molecule acts as a Lewis acid ?

Answer»

`(CH_(3))_(2)O`
`(CH_(3))_(3)P`
`(CH_(3))_(3)N`
`(CH_(3))_(3)B`

Answer :B::C::D
Discussion
22.

What will be the mass of one ""^(12)C atom in g ?

Answer»



SOLUTION :MASS of `""^(12)C` atom `=("ATOMIC mass of C")/("Avogadro No.")`
`=(12g)/(6.022xx10^(23))`
`=1.9927xx10^(23)g`
Discussion
23.

The valence shell of transition element consists of

Answer»

ND orbitals
(n - 1)d - orbitals
NS np nd orbitals
(n-1)d ns np orbitals

ANSWER :B
Discussion
24.

Using the standart electrode potential find out the pair between which redox reaction is not feasible E^(@) values : Fe^(3+)//Fe^(2+)=+0.77,I_(2)//I^(-)=+0.54,Cu^(2+)//Cu=+0.34,Ag^(+)//Ag=+0.80V

Answer»

SOLUTION :CALCULATE the `E_("cell")^(@)` of the four redox reaction If `E_("cell")^(@)` of a reaction is -ve that reaction will not occur
(a) `2Fe^(3+)+2e^(-)rarr2 Fe^(2+),E^(@)=+0.77 V`
`2 I^(-)rarrI_(2)+2e^(-),E^(@)=-0.54V`
`2Fe^(3+)+2I^(-) rarr 2Fe^(2+)+I_(2),E_("Cell")^(@) =+0.23 v`
This reaction is feasible SINCE `E_("cell")^(@)=+0.23V`
(b)`CurarrCu^(2+)+2e^(-),E^(@)=-0.34 V`
`2Ag^(+)+2e^(-)rarr2A,E^(@)=+0.80 V`
`CU+2Ag^(+)rarr2Cu^(2+)+2agE^(@)=+0.46V`
This reaction is feasible since `E^(@)` is +ve
(c ) `2Fe^(3+)+2e^(-)rarr2Fe^(2+),E^(@)=+0.77V`
`CurarrCu^(2+)+2e^(-),E^(@)=-0.34V`
`2Fe^(3+)+Curarr2Fe^(2+)+Cu^(2+),E^(@)=+0.43 V`
This reaction is Feasible since `E_("cell")^(@)` is +ve
(d) `AgrarrAg^(+)+E^(-)E^(2)=-0.80 V`
`Fe^(3+)+E^(-)rarrFe^(2+),E^(@)=-0.03 V`
This reaction is not feasible since `E_(cell)^(@)` is -ve
thus option (d) is correct
Discussion
25.

Which one of the following is correct ?

Answer»




SOLUTION :
Discussion
26.

Treatment of phenol with nitrous acid (NaNO_(2)+HCl) gives mainly

Answer»

p-Nitrosophenol
p-Nitrophenol
Picric acid
m-Nitrophenol

Solution :It GIVES MAINLY PARA nitrosophenol.
Discussion
27.

Write short notes on : (a) Resonance (b) Hyperconjuction

Answer»

Solution :(a) Resonance :
(i) Certain organic compounds can be represented by more than one structure and they differ only in the position of bonding and lone PAIR of electrons.Such structures are called resonance structure and this phenomenon is called as MESOMERISM or mesomeric effect.
(ii) For example, the structure of aromatic compounds such as benzene and conjugated system like 1,3 BUTADIENE cannot be represent by a single structure and their observed properties can be explained on the BASE of a resonance hybrid.
Resonance structure of benzene.

(I) and (II) are called as resonance hybrids of benzene.
(iv) For 1,3 butadine:

(I), (II) and (III) are called as resonance hybrids of 1,3 butadine.
(B) Hyperconjugation:
(i) The delocalization of electrons of `rho` bond is calledas hyperconjugation.It is a special stabilizing effect that results due to the interaction of electrons of a `rho` bond with the adjacent empty non-bonding P-orbitals resulting in an extended molecular orbital.
(ii) Hyperconjugation is a permanent effect.
(iii) For example, in propene, the `rho`-electrons of C-H bond of methyl group can be delocalised into the `pi` - orbital of doubly bonded carbon as represented below.
Discussion
28.

The vapour density of a volatile chloride of a metal is 59.5 and the equivalent mass of the metal is 24. The atomic mass of the element will be

Answer»

96
48
24
12

Answer :B
Discussion
29.

Which one is precipitated in ionic form on Ptelectode ?

Answer»

`Li^(++)`
`Na^(++)`
`MG^(++)`
`Ca^(++)`

ANSWER :C
Discussion
30.

What do you mean by hydroformylation of olefins ?

Answer»
Discussion
31.

Which one of the following is the kinetic energy of a gaseous mixture containg 3 g of hydrogen and 80 g of oxygen at temperature T(K) ?

Answer»

3RT 
6RT 
4RT 
8RT 

ANSWER :B
Discussion
32.

What are the types of chemical equilibrium? Explain with suitable example.

Answer»

SOLUTION :(i) Chemical EQUILIBRIUM is of TWO TYPES: (a) Homogeneous equilibrium (b) Heterogeneous equilibrium. (ii) In a homogeneous equilibrium, all the reactants and products are in the same phase
`H_(2)(g) + I_(2)(g) hArr 2HI(g)`
In the above equilibrium `H_(2),I_(2)` and HI are in the gaseous state.
In the above equilibrium H, I, and HI are in the gaseous state. (iii) If the reactants and products of a reaction in equilibrium are in different phases, then it is called heterogeneous equilibrium.
e.g , `CaCO_(3)(s) hArr CaO(s) + CO_(2)(g)`
Discussion
33.

Which electrons from 2s and 2p experiencing more electron from centre ?

Answer»

SOLUTION :Electrons of 2s ORBITAL experiencing more ATTRACTION than electrons of 2p-orbital.
Discussion
34.

Which of the following cannot reduce Fehling solution ?

Answer»

`HCOOH`
`H_(3)C COOH`
`HCHO`
`H_(3)C CHO`

Solution :`RCOOH` (Where R is an alkyl RADICAL) can not reduce Fehling solution
Discussion
35.

Which of the following electronic configuration belongs to p-block elements ? (i) 1s^(2) 2s^(2) 2p^(6) 3s^(2) "" (ii) 1s^(2)2s^(2) 3p^(6) 3d^(10) 4s^(2) (iii) 1s^(2) 2s^(2) 2p^(5) "" (iv) 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(3)

Answer»

SOLUTION :(III) and (IV)
Discussion
36.

Which instrument is used to determine amount of K?

Answer»

Potentiometer
pH meter
Spectrometer
Flame photometer

Answer :D
Discussion
37.

The source of CO_(2) in the atmosphere is

Answer»

COMBUSTION of FUEL
FERMENTATION
RESPIRATION
All the above

ANSWER :D
Discussion
38.

Water has maximum density and minimum volume at 4^(@)C. Explain.

Answer»


ANSWER :A
Discussion
39.

Which of the following represents correct order of conductivity in solids ?

Answer»

`K_"metals" GT gt K_"INSULATORS" lt K_"semiconductors"`
`K_"metals" lt lt K_"insulators" lt K_"semiconductors"`
`K_"metals" , K_"semiconductors" gt K_"insulators" = zero`
`K_"metals" lt K_"semiconductors" gt K_"insulators" ne zero`

ANSWER :a
Discussion
40.

When neopentyl bromide is subjected to Wurtz reaction, the product formed is:

Answer»

2, 2, 4, 4-tetramethylhexane
2,2, 4, 4-tetramethylpentane
2, 2, 5, 5-tetramethylhexane
2, 2, 3, 3-tetramethylhexane

Solution :`UNDERSET("Neopentyl BROMIDE")(2CH_(3)underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)Br+2Na) to underset("2,2,5,5-tetramethylhexane")(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)-CH_(2)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(3))`
Discussion
41.

What will be the molarity of chloroform in the water sample which contains 15 ppm chloroform by mass?

Answer»

`1.25xx10^(-4)` m
`2.5xx10^(-4)` m
`1.5xx10^(-3)` m
`1.25xx10^(-5)`m

Solution :15 PPM `=(15)/(10^6)xx10^2=1.5xx10^(-3)G`
MOLARITY of `CHCl_3 " solution " =(1.5xx10^(-3))/(100)xx(1000)/(119.5)`
`=1.25xx10^(-4)`
Discussion
42.

Which of the following does not constitute 0.1g mole ?

Answer»

`6.022 xx 10^(22)` molecules of BENZENE
`0.14g " of " N_2` GAS
`2.24 " litre of " CO_2` at S.T.P.
0.40 g of He gas

Solution :`0.14g " of " N_2` gas
Discussion
43.

Which of the following alkynes is most acidic?

Answer»

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

ANSWER :D
Discussion
44.

Which is the function of sodium - potassium pump?

Answer»

 Maintenance of ION balance
Used in NERVE impulse conduction
Transmitting nerve SIGNALS
 Regulates the BLOOD level

Answer :C
Discussion
45.

Which of thefollowinghave nounit ?

Answer»

Electronegativity
Electron gainenthalpy
Ionisationenthalpy
Atomic radii

Solution :ELECTRONEGATIVITYAND metalliccharacterhave nounitswhileelectrongainenthalpyand ionizationenthalpyhaveunitsof Kj `MOL^(-1)`. Thus,OPTIONS (a) is CORRECT.
Discussion
46.

Tritium nucleus contains............

Answer»

`1P +0 n`
`2p +In`
`1p+2N`
none ofthese

Solution :`1p+2n`
sol : `""_(1)T^(3)( I e^(-), 1p , 2n)`
Discussion
47.

Which changes can be done due to vaporization of H_(2)O in atmosphere ?

Answer»

COOLING INCREASES
HEAT increases
(A) and (B) both
NONE of these

Answer :A
Discussion
48.

The separation of the constituents of a mixture by column chromatography depends upon their

Answer»

DIFFERENT solubilities
different boilig POINTS
different REFRACTIVE indices
differential adsorption

Answer :D
Discussion
49.

Which of the following mixture is known as producer gas ?

Answer»

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

ANSWER :A
Discussion
50.

Which processes will increase the number of molecules, to have an energy greater than a particular value

Answer»

INCREASING the temperature 
INTRODUCING more of the same GAS at the same temperature 
compressing the gas at CONSTANT temperature 
decreasing the temperature 

Solution :a) as `T uarr` molecules having energy greater than a particular value `uarr`.
b) when more gas is introduced ,KE remains same but no. of molecules `darr`.
C) constant `T implies` KE constant.
Discussion