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 shape of liquid observe at lowest energy state ?

Answer»

Solution :The lowest energy STATE of the liquid will be when surace AREA is MINIMUM spherical shape satisfies this condition.
Discussion
2.

The series of lines present in the visible region of the hydrogen spectrum is

Answer»

Lyman
Balmer
Paschen
Brackett

Answer :B
Discussion
3.

When gas E reacts with sodium nitroprusside in basic medium then compound Z is formed. The colour of compound Z is :

Answer»

Green
Purple
Reddish brown
Black

Answer :B
Discussion
4.

The solubility of Ag_2CrO_4 is S mol L^(-1) then what is the equation of K_(sp) ?

Answer»

`S^2`
`4S^3`
`S^3`
`S^2/4`

ANSWER :B
Discussion
5.

Which of the following is a correct statement?

Answer»

PAN, `O_3` are formed by CHEMICAL reactions from the PRIMARY pollutants
`SO_2, CO_2` are SECONDARY pollutants
Sewage, DOMESTIC waste are non DEGRADABLE pollutants
DDT, B.H.C, are degradable pollutants.

Answer :A
Discussion
6.

What is the RMS speed of a moist particle of mass 10^(-12)g at 27°C according to kinetic molecular theory?

Answer»

0.35 cm/sec
0.45 cm/sec
0.6 cm/sec
0.7 cm/sec

Answer :A
Discussion
7.

Which one of the following processes will produce permanent hard water ?

Answer»

ADDITION of `Na_(2)SO_(4)` to WATER
Saturation of water with `CaCO_(3)`
Saturation of water with `MgCO_(3)`
Saturation of water with `CaSO_(4)`

Answer :D
Discussion
8.

Which among the following carbocations is most stable :

Answer»

`CH_(3)-CH_(2) - OVERSET(o+)(CH_2)`
`CH_(3)-CH_(2)-CH_2 - overset(o+)(CH_2)`
`CH_(3) - overset(o+)(CH)-CH_3`
`CH_(3)-CH_(2) - overset(o+)(CH) -CH_3`

ANSWER :D
Discussion
9.

What is the effect of the following processes on the bond order in N_(2) and O _(2) ?

Answer»

SOLUTION :(i)`N_(2) (B.O. = 3 )underset(-E^(-))to N_(2)^(+) (B.O.= 2.5).`Thus, bond order decreases.
(ii) `O_(2) (B.O. = 2)underset(-e^(-))to O_(2)^(+) (B.O. = 2.5).` Thus, bond order INCREASES.
Discussion
10.

What will be the volume of N//10 solution of oxalic acid obtained by dissolving 63 g of oxalic acid ?

Answer»


SOLUTION :N//A
Discussion
11.

Which one of the following compounds does not undergo nucleophilic substitution reactions at all?

Answer»

Ethyl BROMIDE
Vinyl CHLORIDE
Benzyl chloride
Isopropyl chloride

SOLUTION :Vinyl chloride
Discussion
12.

Which information was not found beforeMendeleev published periodic table ?

Answer»

Solution :Internal STRUCTURE of ATOM, Particles and Electronic CONFIGURATIONS this type of information was not FOUND before he published PERIODIC table.
Discussion
13.

The standard atmospheric pressure is the pressure that supports a column of mercury exactly_______ high at 0^(@)C at sea level.

Answer»

760 mm
76 CM
both a & b
760 cm

Answer :C
Discussion
14.

The values of K_(P1) and K_(P2) for the reactions : X hArr Y + Z and A hArr 2B are in the ratio 9 : 1 if degree of dissociation and initial concentration of X and A be equal then total pressure at equilibrium P_1, and P_2 are in the ratio

Answer»

`36:1`
`1:1`
`3:1`
`1:9`

SOLUTION :
`K_(P_1)/K_(P_2) = (P_yP_z)/(P_x) XX P_A/P_B^2`
`K_(P_1)/K_(P_2) = [((x/(a+x))P_1 (x/(a+x))P_1)/(((a-x))/((a+x))xxP_1)]xx[(((a-x))/((a+x))P_2)/((4x^2P_2^2)/((a+x)^2))]`
`=((x^2P_1)/((a+x)(a-x)))xx(((a-x)(a+x))/(4x^2P_2))`
`K_(P_1)/K_(P_2) = P_1/(4P_2)`
Given that `K_(P_1)/K_(P_2) = 9/1`
`:. 9.1 = P_1 /(4P_2) rArrP_1/P_2 = 36/1`
Discussion
15.

Which are critical constant ?

Answer»

Solution :(i) Critical TEMPERATURE `T_(C )` (ii) Critical VOLUME `V_(C )` (III) Critical pressure `P_(C )`
Discussion
16.

Which one of the followingis benzene ring deactivator

Answer»

`-CHO`
`-OH`
`-CH_(3)`
`-OCH_(3)`

ANSWER :a
Discussion
17.

What are intermolecular hydrogen bonds? Explain with example.

Answer»

SOLUTION :(i) Intermolecular hydrogen bonds occur between two separate molecules. They can occur between any numbers of like a UNLIKE molecules as long as hydrogen donors and acceptors are present in POSITION in which they can INTERACT
(ii) For eg Intermolecular hydrogen bonds can occur between ammonia molecular ATOM, between water molecules alone or between ammonia and water
Discussion
18.

What do you understand by the term 'auto-prolysis' of water ? What is its significance ?

Answer»

Solution :Auto-protolysis means self ionization of WATER. It may be represented as
`underset("ACID"_(1))(H_(2)O(l))+ underset("Base"_(2))(H_(2)O(l))hArr underset("Acid"_(2))(H_(2)O^(+)(aq))+underset("Base"_(1))(OH^(-)(aq))`
DUE to auto-protolysis , water is amphoteric in nature, i.e., it reacts with both acids and bases. It ACTS as a base towards acids STRONGER than itself and as an acid towards bases stronger than itself. For example,
`underset("Acid"_(1))(H_(2)O(l))+ underset("Base"_(2))(NH_(3)(aq))hArr underset("Acid"_(2))(NH_(4)^(+)(aq))+underset("Base"_(1))(OH^(-)(aq))`
`underset("Acid"_(1))(H_(2)O(l))+ underset("Base"_(2))(H_(2)S(aq))hArr underset("Acid"_(2))(H_(3)O^(+)(aq))+underset("Base"_(1))(HS^(-)(aq))`
Discussion
19.

What is the hybridisation of the central atom in (i) H_(3)O^(+) (ii) XeF_(2) (iii) XeF_(4)? What are their shapes ?

Answer»

SOLUTION :(i) `sp^(3) `, PYRAMIDAL (ii) `sp^(3) d,`linear (III) `sp^(3) d^(2)` , square planar.
Discussion
20.

What will be the pressure exerted by a mixture of 3.2 g of methane and 4.4 g of carbon dioxide contained in a 9 dm^(3) flask at 27 ^(@)C ?

Answer»

Solution :Total no. of moles (n) present in the GASEOUS mixture
`=(3.2)/16 + (4.4)/44 = 0.3`
`( :." mol. mass of " CH_4 = 16 " and mol. mass of " CO_2 = 44)`
ACCORDING to the gas equation,
`PV = nRT`
`:. "" Pxx 9 = 0.3 xx 8.314 xx 10^3 xx 300`
`( :. R = 8.314 xx 10^3 " Pa " dm^3 k^(-1) mol^(-1)`)
or `P= (0.3 xx 8.314 xx 10^3 xx 300)/9`
`=8.314xx10^4 Pa`
Discussion
21.

Which the following reagent can not form tert- pentyl Benzene as the major product?

Answer»

BENZENE + 3 - Methyl 2 - butanol`OVERSET(BF_3)to`
Benzene + Neopentyl alcohol `overset(BF_3)to`
Benzene + 3 - Methyl - 1 - butanol `overset(BF_3)to`
None of the above

Solution :Formation of TERT-pentyl Benzene involves the attack of tert-pentyl CATION on Benzene , so any COMBINATION . Which can form tertpentyl cation will form tert pentyl benzene.
Discussion
22.

What is the effect of introducing an alkyl group on the stability of free radical?

Answer»

SOLUTION :It INCREASES.
Discussion
23.

Which of the following is not formed by the addition of 1 mole of HCl to 2-methyl-1,3cyclohexadiene?

Answer»

3-chloro-1-methylcyclohexene
1-chloro-6-methylcylohexene
3-chloro-3-methylcyclohexene
6-chloro-l-methylcyclohexene

Solution :1-Chloro-6-methylcylohexene is not a product obtained from the addition of HCl to 2-methyl-1,3-cyclohexadiene. To answer this question, DRAW the two resonance STRUCTURES of both of the allylic CARBOCATIONS formed by protonation of the DOUBLE bonds of the starting material (i.e., a total of four resonance structures). Nucleophilic addition of chloride to these carbocations will give the products of this reaction, which will all be allylic chlorides. 1-Chloro-6-methylcylohexene is 6 not an allylic chloride
Discussion
24.

When Znconverts at its melting stste to its solid state,it has HCP structure, then find out the nearest number of atoms.

Answer»

6
8
12
4

Solution :FACTUAL QUESTION.
Discussion
25.

Which among the following has the highest volatility ?

Answer»

`H_(2)O` is NON POLAR
`H_(2)S`
`H_(2)SE`
`H_(2)TE`

Answer :B
Discussion
26.

Which of the following is not the charcteristic of ionic solids ?

Answer»

Very low value of electircal conductivity in the MOLTEN state.
BRITTLE nature.
Very strong, FORCES of interactions.
Anisotropic nature.

Answer :B
Discussion
27.

What happens whenNa is dropped in water

Answer»

SOLUTION :`2Na+2H_2O RARR 2NaOH+H_2`
Discussion
28.

When a sample of Baking soda is strongly ignited in a crucible it suffered a loss in weight of 3.1g. The mass of baking soda is

Answer»

`16.8g`
`8.4g`
`11.6g`
`4.2g`

Solution :The loss in WEIGHT is DUE to MASS of `H_(2)O` and `CO_(2)`
Discussion
29.

Which out of NH_3 and NF_3 has higher dipole moment and why?

Answer»

SOLUTION :REFER to THEORY
Discussion
30.

Which of the following contains a coordinate covalent bond ?

Answer»

`H_(3)O^(+)`
`BF_(3)`
`H_(2)O`
`NH_(4)^(+)`

Answer :A::D
Discussion
31.

Which electron from 28 and 2p orbitals experiencing more shielding effect ?

Answer»

SOLUTION :Electrons of 2p orbitals EXPERIENCING more SHIELDING effect than 2S.
Discussion
32.

When pentan-2-one is oxidised using conc. HNO_(3) the major product will be

Answer»

`n-`Butyric ACID and formic acid
Isobutyric acid and acetic acid
Pentanoic acid
ETHANOIC acid

Solution :`UNDERSET("Pentan-2-one")(CH_(3)CH_(2) - COCH_(3)) OVERSET("conc." HNO_(3))rarr underset("Ethanoic acid")(2CH_(3) COOH)`
Discussion
33.

Which of the following statements are correct about the mechanism of this reaction ?

Answer»

A CARBOCATION will be formed as an intermediate in the reaction.
`OH^(-)` will attach the substrate (ii) from one side and `CI^(-)` will LEAVE it simultaneously from other side.
An unstable intermediate will be formed in which `OH^(-)` and `CL^(-)` will be attached by weak bonds.
Reaction proceeds through `S_(N)1` mechanism.

Answer :A::D
Discussion
34.

Which is not used as a refrigerant

Answer»

`NH_(3)`
`CO_(2)`
`C C l_(2)F_(2)`
`COCl_(2)`

Solution :CO is not USED as a refrigerator
Discussion
35.

Transport of oxygen by Hemoglobin in our body is …………… a reaction .

Answer»

SOLUTION :REVERSIBLE
Discussion
36.

Which of the following dienophiles is the most reactive with buta-1,3-diene?

Answer»




Solution :Compound (c) is the dienophile with the BEST COMBINATION of low steric HINDRANCE and a low-energy LUMO (which is caused by the electron-withdrawing anhydride RESIDUE),
Discussion
37.

Zere witnoff's determination of active hydrogen in a compound is based upon its reaction with

Answer»

NA
`CH_(3)MGI`
Zn
Al

Solution :`R-OH+CH_(3)MgI RARR CH_(4)+Mg(I)OR`.
Discussion
38.

Which of these is not a monomer for a high molecular mass silicon polymer ?

Answer»

`Me_(2)SiCl_(2)`
`Me_(3)SICL`
`PhSiCl_(3)`
`MeSiCl_(3)`

ANSWER :B
Discussion
39.

Which nomenclature is not according to IUPAC system?

Answer»




Solution :`Br-overset(3)(C)H_(2)-overset(2)(C)H=overset(1)(C)H_(2)` is `3-`bromo `-` PROP`-1-`ene.
As bromo is treated as substituent. Hence, while numbering double BOND should get preference.
Discussion
40.

Which of the following has highest octane number

Answer»

n-hexane
n-heptane
n-PENTANE
2,2,-4-trimethyl pentane

Solution :Iso-octance i.e., 2,24-trimethyl pentane has HIGHEST OCTANE NUMBER.
Discussion
41.

underset(("Swollen white mass"))(Na_(2)B_(4)O_(7).XH_(2)O)overset(60^(@)C)rarr underset(("Glassy mass"))(Na_(2)B_(4)O_(7).YH_(2)O)overset(Delta)rarr Na_(2)B_(4)O_(7).ZH_(2)O overset(Delta)rarr B_(2)O_(3)+2NaBO_(2), then the valsue of (x-y+z) is

Answer»


SOLUTION :`Na_(2)B_(4)O_(7).10H_(2)Ooverset(60^@C)rarrNa_(2)B_(4)O_(7).5H_(2)Ooverset(Delta)rarr`
`Na_(2) B_(4)O_(7) overset(Delta) rarr 2NaBO_(2) +B_(2)O_3`
x = 10, y = 5 , Z = 10
x- y + z = 10 - 5 + 0 = 5
Discussion
42.

Which of following is not correct IUPAC name?

Answer»

`underset("Ethyl butanoate")(CH_(3)-CH_(2)-CH_(2)-COO-CH_(2)-CH_(3))`
`underset("3-Methyl butanal")(CH_(3)-underset(underset(CH_(3))(|))(C H)-CH_(2)-CHO)`
`underset("2-Methyl, 3-butanol")(CH_(3)-underset(underset(OH)(|))(C H)-underset(underset(CH_(3))(|))(CH)-CH_(3))`
`underset("2-Methyl-3-pentanone")(CH_(3)-underset(underset(CH_(3))(|))(CH)-underset(underset(O)(||))(C )-CH_(2)-CH_(3))`

ANSWER :C
Discussion
43.

Write the state of hybridisation of carbon in the following compounds and shapes of each of the molecules (a) H_(2)C = O (b) CH_(3)F (c ) HC -= N

Answer»

Solution :(a) In `H_(2)C = O : SP^(2)` hybridised and CARBON shape: TRIGONAL planar
(b)In `CH_(3)F: sp^(3)`hybridised and carbon shape: tetrahedral
(c ) `H- C -= N : sp` hybridised and carbon shape: linear
Discussion
44.

When sodium is dissolved in liquid ammonia, a solution of deep colour is obtained. The colour of the solution is due to

Answer»

'ammoniated ELECTRON
SODIUM ion
sodium amide
ammoniated sodium ion

Solution :DUE to ammonitated electron it EXHIBITS COLOUR
Discussion
45.

Which one of the following is a homogeneous catalysis ?

Answer»

HYDROGENATION of oils
Synthesis of ammonia by Haber's process
Manufacture of SULPHURIC acid by lead chamber process
Manufacture of sulphuric acid by constant process

Solution :In lead chamber process, the REACTANTS (`SO_(2)` and `O_(2)`) as well as the CATALYST (NO) are all gases.
Discussion
46.

The structure of triphenylmethyl cation is given below . This very stable and some of its salts can be stored for months . Explain the cause of high stability of this cation .

Answer»

Solution :
` square ` In triphenylmethyl cation, DUE to RESONANCE the positve charge can MOVE at both the o- and p-positions of each benzene ring .

[ Six more structures are possible due to resonance in other two benzene rings]
` square ` TOTALLY nine resonance structures are possible for 3 benzene rings .
` square therefore ` Triphenylmethyl cation is HIGHLY stable due to these nine resonance structure .
Discussion
47.

Which relation involve iodimetric titration?

Answer»

`2Na_(2)S_(2)O_(3)+I_(2)rarrNa_(2)S_(4)O_(6)+2NaI`
`2MnO_(4)^(-)+2I^(-)+16H^(+)rarr2Mn^(+2)+8H_(2)O+5I_(2)`
`Na_(3)AsO_(3)+I_(2)+H_(2)OrarrNa_(3)AsO_(4)+2HI`
`Cr_(2)O_(7)^(-2)+14H^(+)+5I^(-)rarr2Cr^(+3)+7H_(2)O+3I_(2)`

Solution :`I_(2)` acts as oxidising agent.
Discussion
48.

The flame test with a salt P gave a brick red flame. What is the cation in P.

Answer»

CA
basic
Sr
none of these

SOLUTION :Ca
Discussion
49.

The van der Waal's gas constant 'a' is given by:

Answer»

`(1)/(3)V_(C)`
`3P_(C)V_(C)^(2)`
`(1)/(8)(RT_(C))/(P_(C))`
`(27)/(64)(R^(2)T_(C)^(2))/(P_(C))`

Answer :b,d
Discussion
50.

The shape of nitrite ion is

Answer»

SQUARE planar
Tetrahedral
Trigonal planar
Pyramidal

Answer :C
Discussion