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 exhibit electromeric effect ?

Answer»

Alkanes
Aldehydes
ALKYL halides
Alkyl AMINES

ANSWER :B
Discussion
2.

Which one of the following compounds is an allylic halide?

Answer»




SOLUTION :(a) in vinylic (B) is BENZYLIC (c) is ALLYLIC (d) is arylic
Discussion
3.

Which of the following are wrong ?

Answer»

DE Broglie relation is applicable only to microscopic particles
The UNCERTAINTIES in measurements are due to the imperfections of the TECHNIQUES USED to measure them
The wave function `Psi` ALWAYS has positive values.
There is some probability of finding electron even outside the boundary of the orbital.

Answer :A::B::C
Discussion
4.

The temporary effect in which there is complete transfer of a shared pair of pi-electrons to one of the atoms joined by a multiple bond on the demand of an attacking reagent is called

Answer»

INDUCTIVE effect
hyerpconjugation effect
positive RESONANCE effect
electromeric effect

Answer :D
Discussion
5.

Themajor constituent of natural gas is

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methane
propane
butane
hexane.

Answer :A
Discussion
6.

X-ray diffraction studies show that of copper crystallizes in an fcc unit cell with cell edge of 3.608xx10^(-8) cm. In a separate experiment, copper is determined to have a density of 8.92 g//cm^3, Calculate the atomic mass of copper .

Answer»

SOLUTION :`RHO=(ZxxM)/(a^3xxN_0)` or `M=(rhoxxa^3xxN_0)/Z`
For fcc lattice, Z=4
HENCE, `M=((8.92 G cm^(-3))(3.608xx10^(-8) cm)^3 (6.022xx10^23 "atom mol"^(-1)))/"4 atoms"=63.1 g mol^(-1)`
`therefore` Atomic mass of copper =`63.1 g mol^(-1)`
Discussion
7.

Which of the following represent the correct IUPAC name for the compounds concerned : (i) But-3-yn-1-ol or But-4-ol-1-yne (ii) 4-Chloro-2-methylpentane or 2-Chloro-4-methylpentane (iii) 2, 2,-Dimethylpentane or 2-Dimethylpentane (iv) 2, 3- Dimethylpentane or 3, 4,-Dimethylpentane (v) 2, 4, 7- Trimethyloctane or 2, 5, 7-Trimethyloctane.

Answer»

Solution :(i) But -3- yn -1 ol : ` Hoverset(4)C = overset(3)C- overset(2)CH_2 - overset(1) CH_2 OH""`Functional group (-OH) gets preference in numbering the carbon chain.
(ii) 2-Chloro--4-methylpentane : `""H_3 overset(1)C -UNDERSET(underset(CI)|)overset(2)CH - overset(3)CH_2 - underset(underset(CH_3)|)overset(4) CH - overset(5)CH_3""`Chloro substituent gets preference in numbering.
(iii) 2, 2 -Dimethylpentane : `H_2 overset(1)C - underset(underset(CH_2)|)overset(underset(2)overset(CH_2)|)C - overset(3)CH_2 - overset(4) CH _2 -overset(5) CH_2""` Position of both the SUBSTITUENTS are indicated separately.
(iv) 2, 3-Dimethylpentane : `overset(1) CH_3 - overset(2)underset(underset(CH_3)|) CH - overset(3) underset(underset(CH_3)|) CH - overset(4) CH_2 - overset(5) CH_2""` It has lowest set of locants.
(v) 2, 4, 7-Trimethyloctane : `overset(1) CH_2 - underset(underset(CH_3)|)overset(2) CH - overset(3)CH_2 - underset(underset(CH_3)|)overset(4)CH- overset(5) CH_2 - overset(6) CH_6 - underset(underset(CH_3)|)overset(7)CH -overset(8) CH_3""` It has lowest set of locants.
Discussion
8.

Which of the following is correct representation of Lewis structure of given species?

Answer»



`O = UNDERSET(O^(-)) underset(|)N =O`

ANSWER :B
Discussion
9.

What is the oxidation number of underlined nitrogen in NH_(4)underlineNO_(3) ?

Answer»

`-3`
`+3`
`+5`
`-1`

Solution :`NH_(4)NO_(3)`
`NH_(4)+N+3(O)=0`
`therefore+1+N+3(-2)=0`
`thereforeN=6-1=+5`
Discussion
10.

What is Mathematical representation of partial gas of Dalton ?

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Solution :`p_("TOTAL")=p_(1)+p_(2)+p_(3)+…….p_(n) ""` …..(i)
`= (n_(1)+n_(2)+….) (RT)/(V) ""` …..(ii)
Discussion
11.

Which has bigger electron affinity in each pair? (a)F or Cl^- ,(b)O or O^- , (c)Na^+ or F ,(d)F or F^-

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ANSWER :(a)F, (B)`O^-` , (C)`NA^+` , (d)F
Discussion
12.

What happens when a mixture of ammonium sulphate and sodium nitrate is heated. Write the equation.

Answer»

Solution :Double decomposition first occurs to form ammonium nitrate which then decomposes to yield laughing gas `(N_(2)O)` as SHOWN in above.
`(NH_(4))_(2)SO_(4)+2NaNO_(3)tounderset("AMM. nitrate")(2NH_(4)NO_(3))+Na_(2)SO_(4)`
Discussion
13.

Which of the following regarding 1,2 or 1,4-conjugate addition of HBr to 1,3-butadiene is false?

Answer»

the kinetic product 3-bromo-1-butane, ARISES from the most stable carbocation intermediate
the thermodynamic product, 1-bromo-2-butene, is the most stable product
the kinetic product is favoured by carrying out the reaction at high temperature
formation of TWO products arises from a common RESONANCE stabilized carbocation intermediate

SOLUTION :The thermodynamic product is favoured by carrying out the reaction at high temperature
Discussion
14.

Which isotope of hydrogen is used as a tracer in organic reactions.

Answer»

Solution :Hydrogen has three isotopes , viz, H, D and T . Due to DIFFERENCE in MASSES, the rate constants of these isotopes with the same substrate are different . In other WORDS , both D and T show isotope effect. But since T is not only radioactive but is also least abundant hydrogen isotope, therefore, D is USED as a TRACER to study the mechanism of organic reactions.
Discussion
15.

Which of the following about the electron is incorrect?

Answer»

It is negatively charged particle.
The mass of ELECTRON is euqal to the mass of neuton.
It is a BASIC constituent of all the atoms
electron mass = `9.10938356 xx 10^(-31)` KILOGRAMS

ANSWER :B
Discussion
16.

Write the Schrodinger wave equation.

Answer»


Answer :SCHRODINGER Wave EQUATION:
`(del^(2)PSI)/(delx^(2))+(del^(2)psi)/(dely^(2))+(del^(2)psi)/(delz^(2))+(8pi^(2)m)/(h^(2))=(E-V)psi=0`
`psi` = amplitude of wave; E = total energy of electron
V = POTENTIAL energy; m = mass of electron
Discussion
17.

Which of the following molecules represents the order of hybridisation sp^2 , sp^2, sp, spfrom left to right atoms?

Answer»

`CH_3- CH = CH - CH_3`
`CH -= C - C -= CH`
`CH_2 = CH - CH = CH_2`
`CH_2 = CH - C -= CH`

SOLUTION :
Discussion
18.

Which of the following orders of ionic radii is correctly represented ?

Answer»

`H^(-) gt H gt H^(+)`
`NA^(+) GTF^(-) gt O^(-2)`
`F^(-) gt O^(-2) gt Na^(+)`
`Al ^(+3) gt MG^(+2) gt N^(-3)`

Answer :A
Discussion
19.

Which one among the following gives a dicarbonyl compound with O_(3) followed by reduction with zinc and water

Answer»

`C_(2)H_(4)`
`C_(6)H_(6)`
`C_(2)H_(2)`
Both 2 & 3

Answer :D
Discussion
20.

Which metal ions are present in waste of electroplating and metal refining industry?

Answer»

Nickel
Chromium
Zinc
All of these

Solution :All of these
Discussion
21.

Write the bond line structure of HC=C-CH=CH_(2)

Answer»

SOLUTION :
Discussion
22.

The weight of 112 ml of oxygen at STP, on liquifaction would be

Answer»

0.32g 
0.64g 
0.16g 
0.96g 

ANSWER :C
Discussion
23.

Which of the following halide compound is water in soluble ?

Answer»

LIF
LICL
LIBR
LiI

Answer :A
Discussion
24.

Vander Waal's constants for three different gases are given: {:("Gas", a, b),(X, 3.0, 0.025),(Y,10.0,0.030),(Z,6.0, 0.035):} Which is correct?

Answer»

maximum CRITICAL TEMPERATURE - Y
most IDEAL behaviour - X
maximum molecular volume - Z
minimum molecular volume - X

Solution :Most ideal = less a, b = x
Min molecular volume = less b = x
Max molecular volume = more b = z
Max critical temperature = more a/b = y .
Discussion
25.

Which of the following reagent is helpful to differentiate ethylene dichloride and ethylidene chloride?

Answer»

Zn/methanol
KOH/ethanol
aqueous KOH
`ZnCl_(2)`/Con HCl

Solution :aqueous KOH
Discussion
26.

What is auto - protolysis of water ?

Answer»
Discussion
27.

Which one of the following is used as propellant for aerosols and foams?

Answer»

FREONS
Methylidene CHLORIDE
CHLORAL
CHLOROFORM

SOLUTION :Freons
Discussion
28.

Which of the followingwaveequationis trure ?

Answer»


ANSWER :C
Discussion
29.

The sodium salt of acid which does not form an alkane when subjected to electrolysis is

Answer»

SODIUM FORMATE
sodium acetate
sodium propanoate
sodium butanoate

Solution :Sodium formate GIVES `H_(2)` gas
Discussion
30.

Which one of the following has pentagonal bipyramidal shape?

Answer»

`SF_(6)`
`IF_(4)^(+)`
`AsF_(5)`
`SF_(4)`

Solution :`AsF_(5)`
Discussion
31.

Which of the following compounds will give blood red colour while doing the Lassaigne's test for N ?

Answer»

`(NH_(2))_(2)CO`
`C_(6)H_(5)SO_(3)H`
`(NH_(2))_(2)CS`
`CHCl_(3)`

Answer :C
Discussion
32.

Which d-orbital is involved insp^(3) d hydridisation and why ?

Answer»

SOLUTION :` d_(z^(2))` . The THREE PLANAR triangular hybrid orbitals MAY be assmed to be formed form ONE s and two p-
orbitals `(sp^(2))`and the remaining p-orbital may combine with ` d_(z^(2))` to form two axial hybrid orbitals.
Discussion
33.

Which one of the followingionshas thelargestnumberof unpairedd electrons ?

Answer»

`Zn^(+2)`
`NI^(+3)`
`Fe^(+2)`
`CU^(+2)`

Solution :`Fe_(z-26) (AR)4S^(2) 3d^(6)`
`Fe^(+2)(A)3d^(6)`
Discussion
34.

What is molar mass ?

Answer»



Solution :The mass of ONE mole i.e. `6.022 XX 10^(23)` atoms is CALLED molar mass.
Discussion
35.

The relative order of acidity of alcohols in comparison to water and ethylene is

Answer»

`H_(2)O gt ROH gt HC -= CH`
`H_(2)O gt HC -= CH gt ROH`
`ROH gt H_(2)O gt HC -= CH`
`ROH gt HC -= CH gt H_(2)O`

SOLUTION :The NEGATIVE charge on oxygen atom after loss of `H^(+)` ions is more STABILISED in WATER than in an alcohol. `HC-=CH` is least acidic of the three.
Discussion
36.

What is Metamerism ?

Answer»

Solution :Metamerism is one kind of structural isomerism which arises due to the unequal distribution of carbon atoms on EITHER side of the functional group or different alkyl groups attached to the either side of the same functional group and having the same molecular FORMULA.
e.g, `C_(4)H_(10)O` : (i) `underset("1-methoxypropane")(CH_(3)-O-CH_(2)-CH_(2)-CH_(3))`
(II) `underset("2-methoxypropane")(CH_(3)-O-underset(CH_(3))underset(|)(CH)-CH_(3))`
(iii) `underset("Ethoxyethane")(CH_(3)-CH_(2)-O-CH_(2)-CH_(3))`
Discussion
37.

The stable +2 ions of lanthanides in aqeous solution are

Answer»

`EU^(2+)`
`CE^(2+)`
`LU^(3+)`
`Fe^(2+)`

ANSWER :A
Discussion
38.

Which of the following does not have zero electron gain enthalpy?

Answer»

Be
Cl
Mg
N

Answer :B
Discussion
39.

The reagent(s) used for softening the temporary hardness of water area) Ca_3(PO_4)_2 b) Ca(OH)_2 c) Na_2CO_3 d) NaOCl

Answer»

Only a & B
Only b & d
Only b & C
Only a & d

ANSWER :C
Discussion
40.

Which acid gives wine red colour with neutral FeCl_(3)

Answer»

PROPANOIC ACID
ACETIC acid
formic acid
none

Solution :SEE Acetic acid
Discussion
41.

What is the nature of photochemical smog?

Answer»

SOLUTION :It is OXIDIZING in NATURE.
Discussion
42.

Which of the following statement are correct ? (A) Sink for CO is ocean (B) Green house effect Causes lowering of temperature of earth's surface (C) To control CO emission by automobiles, usually catalytic converters fitted into exhaust pipes (D) H_(2)SO_(4), herbicides and insecticides form mists

Answer»

A, B
C, D
B, D
A, D

Answer :2
Discussion
43.

The shapes of SF_(4) and XeF_(2)respectively are

Answer»

trigonal bipyramidal and trigonal bipyramidal
see-saw and linear
T-shape and linear
squrae PLANAR and trigonal bipyramidal

Solution :`SF_(4)`has a see-saw shape as it contains four bond
pairs and one lone pair
`XeF_(2)` has `sp^(3)d` hybridisation and linear geometry DUE to presence of THREE lone pairs.
Discussion
44.

When NaCl is dissolved in water, boiling point …………………..

Answer»

SOLUTION :INCREASES
Discussion
45.

The SI unit of pressure is pascal and it is equal to the pressure exerted by

Answer»

a MASS of 10.2 GRAM on `1.00 cm^2` AREA 
a mass of 1.02 gram on `1.00 cm^2` area 
a mass of 1.02 MG on `1.00 cm^2` area 
a mass of 10.2 mg on `1.00 cm^2 `area 

ANSWER :D
Discussion
46.

When R-Mg - X , Grignard's Reagent is treated with solvents can yield alkanes. . What is B ?

Answer»

`CH_4`
`C_2H_6`
`C_3H_8`
`C_4H_(10)`

SOLUTION :
Discussion
47.

Zeolites are

Answer»

SOLUTION :Zeolites are METAL aluminosilicates with some water of hydration. These can be represented by the general formula `M_("X")[(AIO_(2))_("x")(SiO_(2))_(y)]_(n).zH_(2)O` where n is the charge on metal cation.
Permutit `Na_(2)[(AIO_(2))_(2)(SiO_(2))_(2)].xH_(2)O` is an EXAMPLE of zeolite.
Discussion
48.

Which of the following diagaram correctly represents the Boltzmann distribution of molecular speeds at two temperatures T_1 and T_2 where T_2 >T_1 ? (Proportion of molecules = f, molecular speed = v)

Answer»




Solution :As `T uarr` GRAPH MOVES to the right and BECOMES SHORT.
Discussion
49.

Which one of the following elements is unable to form MF_6^(-3)ion ?

Answer»

B
Al
Ga
In

Answer :D
Discussion
50.

The weight of oxalic acid required to reduce 80 ml of 0.4 M KMnO_(4) in acidic medium is

Answer»

`10.08g`
`7.21g`
`16.28g`
`12.4g`

Solution :`w = (N XX GEW xx V("in ml"))/(1000)`
Discussion