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 orders of relative strengths of acids is correct ?

Answer»

`FCH_(2)COOH gt ClCH_(2)COOH gt BrCH_(2) COOH`
`ClCH_(2)COOH gt BrCH_(2)COOH gt FCH_(2)COOH`
`BrCH_(2)COOH gt ClCH_(2)COOH gt FCH_(2) COOH`
`ClCH_(2)COOH gt FCH_(2)COOH gt BrCH_(2)COOH`

SOLUTION :ACIDITY DECREASES with the decrease in electronegativity of HALOGEN i.e.,
`FCH_(2) COOH gt ClCH_(2) COOH gt BrCH_(2)COOH`
Discussion
2.

Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules.Stronge the intermolecular forces, greater is the viscosity. Name the intermolecular forces existing in the following liquidsand arrangethem in the increasing order of their viscosities. Also give reason for the assigned order in one line. Water, hexane (CH_(3)OHCH(OH)CH_(2)OH)

Answer»

Solution :The INCREASING order of viscosity is :
Hexane` LT `Water `lt` Glycerine
REASON. In hexane, there are only London FORCES whereas in water and glycerine, there is hydrogen bonding which is stronger in case of glycerine (because of the PRESENCE of three-OH groups) than that in water.
Discussion
3.

What is the boiling point of water at (i) higher altitudes, (ii) in pressure cooker ?

Answer»

SOLUTION :(i) `GT 100^(@)C "" (II) LT 100^(@)C`
Discussion
4.

The type of isomerism observed in urea molecule is

Answer»

chain
position
geometrical
TAUTOMERISM

Solution :UREA SHOWS tautomerism.
`{:(""O""OH),("||""|"),(H_(2)N-C-NH_(2) oversetrarr(larr)NH=C-NH_(2)),(""alpha""alpha):}`
Discussion
5.

Write the equation for calculation of hydrolyses constant of salt of weak acid weak base solution.

Answer»

SOLUTION :`K_h=K_w/(K_a XX K_b)`
Discussion
6.

The solutions of Schrodinger wave equation gives the allowed ________.

Answer»

ENERGY levels
Eiger values
equation
a & b

Answer :A
Discussion
7.

Which of the following statement is false about resonance?

Answer»

It increases the STABILITY of a molecule
It leads to SIMILAR TYPE of BONDS
It increases reactivity of the molecule
It decreases reactivity of the molecule

Answer :C
Discussion
8.

The Zn acts as sacrified of cathodic protection to prevent rusting of ironbecause:

Answer»

`E_(OP)^(@)` of `ZnltE_(OP)^(@)` of FE
`E_(OP)^(@)` of `ZngtE_(OP)^(@)` of Fe
`E_(OP)^(@)` of `Zn=E_(OP)^(@)` of Fe
Zn is CHEAPER than iron

Answer :B
Discussion
9.

Which electronic level would allow the hydrogen atom to emit a photon but not to absorb a photon?

Answer»

3
2
1
4

Solution :ground STATE electron absorbs PHOTON and CANT EMIT photon
Discussion
10.

The structure of 4-methylpentene-2 is

Answer»

`(CH_2)_2 CH- CH_3CH = CH_2`
`(CH_3 )_2 CH - CH = CH - CH_3`
`(CH_3)_2 CH - CH_2 - CH = CH - CH_3`
`(CH_3)_2C = CH - CH_2 - CH_3`

ANSWER :B
Discussion
11.

The smallest stable cyclic alkyne contains ( no.of carbon atoms).

Answer»


SOLUTION :CYCLIC ALKYNE
Discussion
12.

What are the general formulae for monocyclic and bicyclic cycloalkanes ?

Answer»

SOLUTION :`C_nH_(2N)` and `C_n H_(2n - 2)`
Discussion
13.

Which of the following metals dissolve in liquid NH_(3)

Answer»

`SR`
`CA`
`BA`
`Be`

Solution :Be. doesn.t dissolve in `NH_(3)`.
Discussion
14.

Which one of the followingrepresents 180g of water?

Answer»

5 MOLES of water
90 moles of water
`(6.022xx10^(23))/180` Molecules of water
`6.022xx10^(24)` Molecules of water

Solution :No. of moles of water present in 180 g
=Mass of water / Molar mass of water
180g/18g `"MOL"^(-1)`=10 moles
One mole of water contains
`6.022xx10^(23)` water molecules
10 moles of water contains=`6.022xx10^(23)xx10=6.022xx10^(24)` water molecules
Discussion
15.

Which of the following substances is not used for preparing lyophilic sols

Answer»

Starch
gum
gelatin
METAL sulphide

Solution :Metal sulphide is not sued for preparing LYOPHILIC SOL.
Discussion
16.

To get n-type semicoductor from silicon, it should be doped with a substance with group no.……

Answer»

12
15
13
15

Answer :B
Discussion
17.

Which one of the following statements is incorrect with regard to ortho and para dihydrogen ?

Answer»

They are NUCLEAR spin isomers
Ortho ISOMER has zero nuclear spin whereas the PARA isomer has ONE nuclear spin
The para isomer is favoured at low temperatures
The thermal conductivity of the para isomer is 50% greater than that of the ortho isomer.

Solution :Ortho isomer-one nuclear spin
Para isomer - zero nuclear spin
Discussion
18.

What type of interactions hold the molecules together in a polar molecular solid ?

Answer»

SOLUTION :Dipole-Dipole ATTRACTIONS.
Discussion
19.

Type of hybridisation of central atom of gas (B):

Answer»

`SP^(3)`
`sp^(2)`
`sp^(3)`
no hybridization

Solution :`{:(A rarr Pb(NO_(3))_(2),,B rarrNO_(2)(sp^(2))),(Crarr N_(2)O_(3),,Drarr HNO_(2),),(E rarr[Fe(H_(2)O)_(5)NO]SO_(4)(sp^(3)d^(2)),FrarrPbS,),(G rarr H_(2)O,,H rarr NO,):}`
`I rarr PbCrO_(4) (ACOH` insoluble)
`HNO_(2) +I^(-) +H^(+) rarr NO` (Gas H)
Discussion
20.

Whichof the following compoundsis not aromatic ?

Answer»




Solution :(a) has a CYCLIC cloud of `2 pi`-ELECTRONS and HENCE is AROMATIC. (b) and (d) have a cyclic cloud of six `pi`-electrons and hence are aromatic while (c ) has 4 `pi`-electrons and hence is antiaromatic.
Discussion
21.

Which law of thermodynamics gives information about exact entropy of a substance ?

Answer»

Zeroth Law
Second Law
Third Law
First Law

Solution :ENTROPY is state function. It is intensive PROPERTY. Absolute value of entropy can be calculated.
`DELTA H = q_("rev") and Delta S= (Delta H)/( T) and Delta S= S_("FINAL state") -S_("initial state")`
Discussion
22.

Which of the following reagents can be empolyedfor isomerisation of n-butane?

Answer»

HI/P
`Al_(2)Cl_(6)//HCl_((g))`
`LiAlH_4`
None

Answer :B
Discussion
23.

Which of the following carbanion expected to be most stable?

Answer»

`p-NO_(2)C_(^)H_(4)overset(-)(C)H_(2)`
`o-NO_(2)C_(6)H_(4)overset(-)(C)H_(2)`
`o-CHOC_(6)H_(4)CH_(2)`
`p-CHOC_(6)H_(4)CH_(2)`

Solution :Carbanions are stabilised by electron withdrawing groups. `-NO_(2)` is stronger electron withdrawing group as compared to `-CHO`. At ortho-position, the EFFECT is more pronounced.
Discussion
24.

When an element sulphur atom becomes a sulphide ion, "______________".

Answer»

there is no change in the composition of atom
it gains TWO ELECTRONS
the MASS number changes
non of these

Answer :B
Discussion
25.

The wavelength associated with a golf ball weighing 200g and moving at a speed of 5 m/h is of the order

Answer»

`10^(-10)m`
`10^(-20)m`
`10^(-30)m`
`10^(-40)m`

ANSWER :C
Discussion
26.

Which of the following compound will give three alkenes after dehydrohalogenation.

Answer»

`CH_3-CH_2-CH_2-CH_2-BR`
`CH_3-CH_2-undersetunderset(Br)(|)CH-CH_3`
`CH_3-undersetunderset(Br)(|)oversetoverset(CH_3)(|)C-CH_3`
`CH_3-CH_2-undersetunderset(Br)(|)CH-Ph`

ANSWER :B
Discussion
27.

Which of the following pair of solutions does not form a buffer solution?

Answer»

` NaH_2PO_4 and Na_2HPO_4`
` H_2CO_3 and NaHCO_3`
` NH_4 OH and H_4 CL`
KOH and `K_2 SO_4`

SOLUTION :KOH is a strong BASE and `K_2SO_4` is a salt of SA and SB
Discussion
28.

Which of the following shows geometrical isomers ?

Answer»

`CH_(2) = CHCl`
`CH_(3)CH = CH_(2)`
`CHCl = CHCl`
`(CH_(3))_(2)C=CHC_(2)H_(5)`

Solution : `CH-CL=CH-CL` POSSESS geometrical ISOMERS.
Discussion
29.

Which of the following transfer of electron pair from pi bond to its adjacent bond?

Answer»




ANSWER :C
Discussion
30.

The starting element of fifth period is

Answer»

K 
RB 
Kr 
XE 

ANSWER :B
Discussion
31.

What is the valency of an element with Z= 15 ?

Answer»


ANSWER :2
Discussion
32.

Two metals X and Y belong to the cond group of periodic table. X forms insoluble oxide but soluble sulphate. Y forms a soluble oxide but insoluble sulphate. Hydroxide of metal X is soluble in NaOH while that of metal Y is insoluble in NaOH. What are metals X and Y?

Answer»

X=Be,Y=BA
X=Mg,Y=Ca
X=Ca,Y=Sr
X=Ba,Y=Mg

Solution :BeO-Insoluble, `BeSO_(4)`-soluble BaO-soluble, `BaSO_(4)`-Insoluble
`Be(OH)_(2)`-soluble in NAOH
`Ba(OH)_(2)`-insoluble in NaOH
Discussion
33.

Write the chemical equationwhen borax dissolve in water ?

Answer»
Discussion
34.

Which metal carbonates are majorly present in ash of plant herb ?

Answer»

RB and CS
Fr
Sr and Ra
Na and K

ANSWER :D
Discussion
35.

What are the equivalent volumes of oxygen and chlorine at STP?

Answer»


ANSWER :5.6L and 11.2L
Discussion
36.

What will be bond angle C-O-H in alcohol if C and O atom possess sp^(3) hybridizations?

Answer»

`190^(@) 28'`
`111^(@) 42'`
`109^(@)`
`108.3^(@)`

ANSWER :C
Discussion
37.

Write the structural formula and carbon skeleton formula for all possible chain isomer of C_(6)H_(14) (Hexan)

Answer»

Solution :`C_6H_(14) ` has five POSSIBLE ISOMERIC STRUCTURE
Discussion
38.

which of the following is not true about the ionic solids ?

Answer»

Bigger IONS from the close packed structure
Smaller ions occupy either the tetrahedral or the octahedral VOIDS depending upon their size
Occupation of all the voids is not necessary
The fraction of octahedral or tetrahedral voids occupied DEPENDS upon the radii of the ions occupying the voids .

Solution :Tetrahedral voids are ALWAYS double than octahedral voids. Hence (d) is not TRUE.
Discussion
39.

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

Answer»

Solution :1 mol of `""^(12)C` atom , i.e. `6.022 xx 10^(23)` atoms weigh 12 G.
`THEREFORE` Mass of one `""^(12)C` atom `=12/(6.022 xx 10^(23)) = 1.9923 xx 10^(-23)` g
Discussion
40.

Which of the following explains the sequence of filling electrons in different subshells?

Answer»

HUND's rule
Aufbau PRINCIPLE
Pauli's principle
All of these.

Answer :B
Discussion
41.

Which bond is formed by overlapping of 2p_(x) with 2p_(y) ? Why ?

Answer»

Solution :The BOND is not formed by this COMBINATION because `2p_(x) and 2p_(y)` are PARALLEL to each other. So no overlapping by each other.
Discussion
42.

Whichtype of solid is SiC ?

Answer»

SOLUTION :SIC is COVALENT or NETWORK SOLID .
Discussion
43.

What is formed when calcium carbide react with heavy water?

Answer»

`CD_2`
`CaD_2`
`CaD_2O`
`C_2D_2`

SOLUTION :`CaC_2 + D_2O to C_2D_2 + CA(OD)_2`
Discussion
44.

Whoproposedthat electronhas wavenature ?

Answer»

Schrodinger
De- BROGLIE
Heiseneberg
NONE

ANSWER :B
Discussion
45.

What will be the wavelength of oxygen molecule in picometers moving with a velocity of 660 m s^(-1) (h = 6.6 xx 10^(-34) kg m^(2) s^(-1))

Answer»


SOLUTION :`m = (32 XX 10^(-3) KG)/(6.02 xx 10^(23)), 1` pm = `10^(-12)m`
Discussion
46.

What is the difference between alkyl group and alkane?

Answer»

ONE CARBON is more in alkane
One HYDROGEN is more in alkane
One hydrogen is LESS in alkane
One carbon is less in alkane

Answer :B
Discussion
47.

The strength of the covalent bond in H_(2) , F_(2) and HF is in the order

Answer»

`H-HgtF-FgtH-F`
`H-FgtF-FgtH-H`
`H-FgtH-HgtF-F`
`F-FgtH-FgtF-F`

SOLUTION :`H-F gt H-H gt F-F`
Bond strengths `(KJ MOL^(-1)) ` 566436126
This is because they involve s-p,s-s and p-p
OVERLAP respectively.Greater the overlap , stronger
is the bond .
Discussion
48.

Which among the following molecule obeys octet reule ?

Answer»

`NO`
`NO_(2)`
`N_(2)O_(3)`
`C//O_(2)`

ANSWER :c
Discussion
49.

Using the data provided, calculate the bond energy( kJ mol^(-1))of a C-=C bond in C_(2)H_(2).That eneergy is ( take the bond energy ofC-H bond as350 kJ mol^(-1))2C(s) + H_(2)(g) rarr C_(2)H_(2)(g)" " DeltaH = 225 kJ mol^(-1) 2C(s) rarr 2C(g) " " DeltaH = 1410 kJ mol^(-1) H_(2)(g) rarr 2H(g)" " DeltaH = 330 kJ mol^(-1)

Answer»

1165
837
875
815

Solution :(i) `2C(s) + H_(2)(g) rarr H-C-= C-H(g), DeltaH=225kJ mol^(-1)`
(II) `2C(s) rarr 2C(g) , DeltaH = 1410kJ mol^(-1)`
(iii) `H_92)9g)rar 2H(g), DeltaH = 330 KJ mol^(-1)`
From eq. (i)
`225= [2 xxDelta_(C(s) rarr C(g)) + BE_(H-H)]-[2BE_(C-H)+BE(C-=C)]`
or `225=[ 1410 + 330]-[2 xx 350 k+ BE_(C-=C)]`
or ` 225=1740- 700- BE_(C-=C)`
or`BE_(C-=C) 1040-225 = 815kJ mol^(-1)`
Discussion
50.

What is Green chemistry ?

Answer»

Solution :(i) Green CHEMISTY is chemical PHILOSOPHY encouraging the design of products and PROCESSES that reduces or eliminates the use and genration of hazardous substances.
(ii) Efforst to control enviromental pollution RESULTED in development of science for the SYNTHESIS of chemicals favourable to enviroment .
(iii) Green chemistry means science of enviromentally favourable chemical sysnthesis.
Discussion