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.

Pick up the incorrect statement

Answer»

Mesomeric EFFECT occurs in conjugated compounds
Inductive effect is transmitted over only QUITE a short length
Due to mesomeric effect, electron PAIR is TRANSFERRED completely
Inductive effect is a polarisability effect

Answer :D
2.

Pick up the error an write the correct IUPAC names for the following. (i) 3-Pentyne (ii) 1, 6-Hexadiene (iii) 2-Ethyl-2-pentene (iv) 1, 2-Dihydroxyethane (v) Pent-4-en-1-yne.

Answer»


ANSWER :(i) Pent-2-yne (II) Hexa-1, 5-diene (III) 3-Methylhex-3-ene (IV) Ethane-1, 2-diol (V) Pent-1-en-4-yne.
3.

Pick up the correct statements

Answer»

Mesomeric effect OCCURS in COMPOUNDS having conjugate SYSTEM of double bonds
Inductive effect is transmitted over to few carbon ATOMS
Due to mesomeric effect, electron pair is TRANSFERRED completely
Inductive effect is a polarisability effect

Solution :Mesomeric effect occurs in compounds having conjugate system of double bonds. Inductive effect is transmitted over to few carbon atoms.
Due to mesomeric effect, electron pair is trans ferred completely.
4.

Pick up the correct statement about the solution on an alkali metal in liquid ammonia

Answer»

The SOLUTION SHOWS PARAMAGNETISM which DECREASES with increasing concentration
The solution is a good conductor of electricity whose conductivity increases on cooling
The solution is a good reducing agnet
All are correct 

ANSWER :D
5.

Pick up the correct statement

Answer»

CO which is a major pollutant RESULTING from the combustion of fuels in automobiles plays a major ROLE in photochemical smog
Classical smog has an oxidizing character while the photochemical smog is reducing in character
Photochemical smog occurs in day time whereas the classical smog occurs in the morning hours
During formation of smog occurs in the morning hours During formation of smog the level of ozone in the atmosphere GOES down

Answer :C
6.

Pick the odd one out

Answer»

Graphite
Silicon
`CrO_(2)`
Copper

Solution :Graphite , `CrO_(2)` and copper are all good CONDUCTORS of ELECTRICITY.
7.

Pick the electrophiles and nucleophiles from the following : (a) NH_(3) (b) NO_(2)^(+) (c) CN^(-) (d) RNH_(2) (e) SO_(3) (f) ROH (g) RO^(-) (h) FeCl_(3)

Answer»

SOLUTION :ELECTROPHILES : `NO_(2)^(+), SO_(3), FeCl_(3)`
8.

Pick the incorrect statement about the factors affecting ionization energy

Answer»

More is the shielding of valence ELECTRONS more is the ionization energy
Ionization enthaply `prop` EFFECTIVE nuclear charge
Half FILLED or full filled ATOMIC orbitals have HIGH ionization energy
Larger is the atomic radii lower is ionization energy

Answer :a
9.

Pick the equation that gives you the relationship between molecular mass and density.

Answer»

<P>`M=(dRT)/(P)`
`PV=nRT`
both (a) & (B)
NEITHER (a) nor (b)

ANSWER :A
10.

Pick the acid odd out with respect to acid rain. H_(2) SO_(4) ,HCl, HNO_(3), H_(2)CO_(3), CH_(3)COOH, H_(2)SO_(4)

Answer»

Solution :`CH_(3)COOH`- it is not present in ACID RAIN.
11.

Pick out true statements (s) (i) q and w are path functions (ii) q + w is a state function

Answer»

Only (i)
Only (II)
Both (i) and (ii)
Both are INCORRECT STATEMENTS

ANSWER :C
12.

Pick out the wrong statement

Answer»

SPHALERITE is ZINC sulphide
`CrO_(2)`is ferromagnetic
All ferroelectric solids are PIEZOELECTRIC
All piezoelectric solids are ferroelectric

Solution :All piezoelectric solidsare not ferroelectric.
13.

Pick out the pair of gases with the same rate of diffusion

Answer»

`CO, NO` 
`N_2O, CO` 
`N_2O, CO` 
`CO_2, NO_2` 

ANSWER :C
14.

Pick out the odd one out

Answer»

Cyclotron
Wilson CLOUD chamber
Spinthariscope
Geiger -MULLER counter

Answer :A
15.

Pick out the molecule which possess diamagnetic behaviour.

Answer»

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

ANSWER :B
16.

Pick out the most stable carbonium ion

Answer»

`C_(6)H_(5) - UNDERSET(underset(C_(6)H_(5))(|))OVERSET(+)(C )-C_(6)H_(5)`
`CH_(3) - underset(underset(CH_(3))(|))overset(+)(C )-CH_(3)`
`CH_(3) - overset(+)(C )H- CH_(3)`
`CH_(3) - CH_(2) - overset(+)(C H_(2))`

ANSWER :A
17.

Pick out the incorrect statement from the following.

Answer»

`sp^(3)` hybrid orbitals are equivalent and are at an ANGLE of `109^(@), 28'` with eachother
`dsp^(2)` hybrid orbitals are equivalent and bond angle between any two of them is `90^(@)`
All FIVE `sp^(3)` d hybrid orbitals are not equivalent out of these five `sp^(3)` d hybrid orbitals, three are at an angle of `120^(@)`, remainir two are perpendicular to the PLANE containing the other three
none of these

Answer :C
18.

Pick out the incorrect statement

Answer»

Energy RELEASED PER GRAM is more is case of FUSION than in FISSION
Energy released per mole is more in case of fusion than in fission
Energy released per gram is more in case of fission than in fusion
Energy released per mole is less in case of fission than in fusion.

Answer :A
19.

Pick out the in-correct statement about "C" from the following for the following reaction scheme. H_3C - C -= CH overset(Na)to A overset(H_3C - Cl)to B + H_2 underset("passadised charcoal ")overset("partially deactivated") to C

Answer»

The product C on reductive OZONOLYSIS gives only acetaldehyde
The product C can't decolourise bromine WATER.
The product C on reaction with `Br_2//C Cl`, gives racemic mixture
The compound C DECOLOURISES COLD alkaline `KMnO_4` forming a meso compound

Solution :The product C is cis-2-butene, which is unsaturated and decolorises bromine water.
20.

Pick out the error and write correct IUPAC name of pent-3-yne.

Answer»

Solution :POSITION of triple bond, `CH_(3)CH_(2)C EQUIV C CH_(3)`. (Pent-2-yne)
21.

Pick out the correct statements(s) of the following

Answer»

All atoms with an odd ATOMIC number are necessarily PARAMAGNETIC.
All atoms with an even atomic number are necessarily diamagnetic
All atoms with an even atomic number MAY be diamagnetic or paramagnetic
Atoms with an odd atomic number may be paramagnetic and in some cases diamagnetic.

Answer :A::C
22.

Pick out the correct statement(s) from the following?

Answer»

Nitration of nitroso benzene and nitrobenzene gives meta derivatives
Nitrobenzene does not undergo Friedel-Crafts reaction.
Tertiary BUTYL benzene on OXIDATION with `KMnO_4 //H^(+)` gives benzoic acid
Ethyl benzene and o-Xylene on oxidation with gives same product

Solution :Since nitro group is very STRONG DEACTIVATING group , Friedel-Crafts reaction does not occur
23.

Pick out the correct statement (s)

Answer»

C.N. of an atom at a LATTICE point in SIMPLE cubic arrangement is 6
C.N. of an atom at an OCTAHEDRAL site is 8
C.N. of an atom at a lattice point in HCP arrangement is 6
C.N. of an atom at octahedral site is 6

Solution :C.N. of atoms at a lattice point insimple cubic arrangement is 6.
24.

Pick out the correct statement from the following: 1. Cobalt (III) is more stable in octahedral complexes. 2. Zinc forms coloured ions or complexes 3.Most of the d-block elements and their compounds are ferromagnetic. ltBrgt 4. Osmium shows (VIII) oxidation state 5. cobalt (II) is more stable in octahedral complexes.

Answer»

1 and 2
1 and 3
2 and 4
1 and 4

Solution :In `Co^(+3)` ion, ELECTRONIC configuration `|Ar|_(18)3d^(6)4s^(0)`. For octahedral complex 4 UNPAIRED electron get paired and in configuration become `t_(2g)^(6)eg^(0)` and HYBRIDIZATION `d^(2)sp^3`
Os has maximum VIII oxidation state.
25.

Pick out the correct statement from among the four:

Answer»

When a LIQUID BOILS, work is done on the SYSTEM
In case of BOILING of a liquid `Delta H = Delta U`
When a liquid boils at its boiling temperature, `Q_(P) = Delta H`
For the process of boiling of a liquid Q = 0

Solution :When liquid boils, work done by system and `q_(p) = Delta H`
26.

Pick out the correct statement about CsCl structure

Answer»

`CL^(-)` adopts a simple cubic lattice
CsCl has a BCC structure
`Cl^(-)`ions are PRESENT at cubic sites
C.N of both CS and Cl is 6.

Solution :In CsCl UNIT cell, `Cl^(-)`ions adopt a SINGLE cubic lattice while `Cs^(+)`ions are present at the cubic sites. It does not represent a BCC unit cell.
27.

Pick out the correct statement

Answer»

Inner CORE of the EARTH is made up of ALMOST PURE solid iron
Inner core of the earth is made up of almost pure molten iron
Inner core of the earth is made up of molten rock
Inner core of the earth is made up of solid rock.

Answer :A
28.

Pick out the correct relation for 1 mole of real gas.

Answer»

`(P+(V)/(a^(2)))(V-b)=RT`
`P=(RT)/((V-b))+(a)/(V^(2))`
`(P+(a)/(V^(2)))(V-b)=RT`
`(P-(a)/(V^(2)))(V+b)=(1)/(RT)`

Answer :C
29.

Pick out the correct order of acid strength .

Answer»

`CH_3 -CH_2 - COOH GT CH_3 COOH gt CH_2 CL COOH`
`CH_3 COOH gt CH_3-CH_2 -COOH gt CH_2 Cl COOH`
`CH_3 Cl COOH gt CH_3 COOH gt CH_3 - CH_2 - COOH`
`CH_2ClCOOH gt CH_3 -CH_2-COOH gt CH_3COOH`

SOLUTION :`CH_2ClCOOH gt CH_3COOH gt CH_3-CH_2-COOH`
30.

Pick out the correct order of acid strength,

Answer»

`CH_(3)-CH_(2)-COOH GT CH_(3)COOH gt CH_(2)CICOOH`
`CH_(3)COOH gt CH_(3)-CH_(2)-COOH gt CH_(2)CICOOH`
`CH_(2)CIOOH gt CH_(3)COOH gt CH_(3)-CH_(2)-COOH`
`CH_(2)CIOOH gt CH_(3)-CH_(2)-COOH gt CH_(3)COOH`

ANSWER :C
31.

Pick out the alkane while differs from the other members of the group.

Answer»

2,2-dimethylpropane
pentane
3-methylbutane
2,2-dimethylbutane

Solution :(a),(B) and (C ) are all ISOMERS but (d) is not .
32.

Pick out th eunsaturated fatty acid from the following

Answer»

STEARIC acid
lauric acid
oleic acid
palmitic acid

Solution :SEE NOMENCLATURE UNSATURATED ACIDS
33.

Pick out te statement which is not relevant in the discussion of colloids

Answer»

Sodium aluminium silicate is USED in the softening of hard water
Potash ALUM is used in shaving rounds and as ANTISEPTIC in medicine
Artificial rain is caused by throwing ELECTRIFIED sand on the clouds from an aeroplane
Deltas are formed at a PLACE where the river pours its water into the sea

Answer :A
34.

Pick out incorrect statements

Answer»

The volume of 0.1M `FeC_(2)O_(4)` solution required to reduce 200 ML of 0.6 M `K_(2)Cr_(2)O_(7)` in ACIDIC medium is 2400 ml
The volume of 0.1M `Ca(OH)_(2)` required to neutralise 0.2 `MH_(3)PO_(3)` solution of volume `0.25dm^(3)` is 500 ml
EQUIVALENT weight of sulphate ion is 49
Molality is influenced by change in temperature

Solution :a) No. of meQ of `K_(2)Cr_(2)O_(7)`
`=200xx0.6xx6=720`
No. of mec of `FeC_(2)O_(4)=720`
`720=V` in `mlxx0.1xx3`
`V=(720)/(0.2)=2400ml`
b) `Vxx0.1xx2=250xx0.2xx2,V=500ml`
c) `SO_(4)^(--)` Eqwt = `(96)/(2)=48`
d) Molality is weight factor. Not influenced by temperature.
35.

Pick out correct statement among the following about the equal volume of N_(2)(g) and O_(2)(g) at 298K and 1 atm:

Answer»

The AVERAGE translational kinetic ENERGY per MOLECULE is same of `N_(2)(g)` and `O_(2)(g)`
The most probable speed of TWO gases is same
The toal translational kinetic energy of `N_(2)(g)` and `O_(2)(g)` is same
The absolute entropy of both gases is same.

Answer :a
36.

Pick out correct statements regarding orystalline form of boran

Answer»

All allotropic forms of boran contais is icosahedral units with boran ATOMS at all 12 corners.
In `B_(12)` units each boran atoms is bonded to five boran atoms as a distance of `1.77 Å`
`alpha` - RHOMBOHEDRAL FORM of boran consists of layers of icosahedra linked with in each layer by three centre B-B bonds and between layers B-B bonds
`beta` - rhombohedral form consists of `12B_(12)` icosahedra arranged icoshedral about central `B_(12)` unit `(B_(12)(B_(12))_(12))`

Solution :Allotropy of boron contains icosahedral units and boran atoms at 12 carbons.
In `B_(12)` units each boran atom is bonded to 5 boron atoms `beta` rhombo hedral consists of 12 `B_(12)` icosahedral arrangement.
37.

Pick out correct statements

Answer»

One GRAM equivalent of oxygen at STP occupies 5.6 litres
The molarity of 10 VOLUME `H_(2)O_(2)` is 0.89 M
Phenolphthalein indicates only HALF NEUTRALISATION of `Na_(2)CO_(3)`
Empirical formula of benzene is CH

Solution :a) one gram equivalent of oxygen = 8g
b) 1 Volume `H_(2)O_(2)=0.089 M`
c) CORRECT statement
d) Molecular formula `C_(6)H_(6)`
38.

Pick out among the following, the form of silica different from the rest

Answer»

Quartz
Jasper
Crystobalite
Tridymite

Solution :Jasper is mostly an AMORPHOUS form. The OTHERS ers are CRYSTALLINE forms
39.

pi_(2px)^(**) differs from pi_(2py)^(**) molecular orbital in which of the following

Answer»

NUMBER of PLANES
Energy
SYMMETRY
Shape

ANSWER :A
40.

pi^(@) meson is exchanged between :

Answer»

PROTON and neutron
proton and proton
neutron and neutron
may be between TEO protons OT two neutrons

Answer :D
41.

Physical properties of water.

Answer»

Solution :Water is a colourless and tasteless liquid. The unusual properties of water in the condensed phase (liquid and solid STATES) are DUE to the presence of extensive hydrogen bonding between water molecules.
This leads to high freezing point, high boiling point, high heat of vaporisations and high heat of fusion in comparison to `H_2 S` and `H_2Se`.
In comparison to other liquids, water has a higher specific heat, thermal conductivity, surface tension, DIPOLE moment and dielectric constant, etc.
These properties allow water to play a key role in the biosphere.
It is an excellent solvent for transportation of IONS and molecules required for plant and animal metabolism.
Due to hydrogen bonding with polar molecules, even covalent compounds like ALCOHOL and carbohydrates dissolve in water.
Physical properties of `H_2O` and `D_2O`

42.

…..physical proporty is changed by increase of molecular mass in homologous series

Answer»

BOILING point
Melting point
Density
All

Answer :D
43.

Physical properties of ice, water and steam are very different. What is the chemical composition of water in all the three states ?

Answer»

SOLUTION :Physical properties of ice, water and STEM differs because they are FOUND in different states. Ice is found in solid, water in LIQUID and steam in vapour states. Chemical composition of water in all the three states is same, i.e., `H_(2)O`.
44.

Physical properties of ice, water and steam are very different. What is the chemical composition of water in all the three states.

Answer»

Solution :Chemical composition is same in all the three STATES, i.e., `H_(2)O`.
45.

PhSO_2CH_2-CH_2-OMeunderset(EtOD) overset(EtO^(theta))to"product"+underset("(recovered reactant)")(PhSO_2-oversetoverset(D)(|)CH-CH_2OMe. The product is :

Answer»

`PhSO_2CH=CH_2`
`CH_2=CH-O Me`
`PhSO_2CH_2-CD_2OMe`
`CD_2=CH_2`

SOLUTION :The REACTION FOLLOWS E1CB mechanism in which reactant undergoes D exchange alongwith an ELIMINATION product.
46.

Photosynthesis utilizes ......... tons of CO_2 annually from atmosphere.

Answer»

2200 CRORE
1600 crore
200 crore
2000 crore

Solution :2200 crore
47.

Photosynthesis involves the following overall reaction 6CO_(2)+6H_(2)O overset("sunlight")underset("chlorophyll")to C_(6)H_(12)O_(6)+6O_(2) Identify the species oxidised and the species reduced

Answer»

Solution :Photosynthesis involves a series of complex REACTIONS but the overall reaction involves reduction of `CO_(2) to C_(6)H_(12)O_(6)` and OXIDATION of `H_(2)O to O_(2)` as explained below
48.

Photosyntesis is a bio process by which planets make energy rich molecules from low energy molecules with the help of energy. From sunlight. The photosynthesis of glucose can be represented as : 6CO_(2)(g)+6H_(2)O(g)+hvrarrC_(6)H_(12)O(s)+60_(2)(g) Electrochemical oxidation of glucoses to CO_(2) and H_(2)O. which is the reverse of photosyhnthesis, is an impottaint reaction and it can be used in the construction of a fuel cell. In a fule cell, a working substance celled fule is electrochemiclly oxidised by O_(2) C_(6)H_(12)O_(6)+6HOrarr24_(e)^(-)+24H^(+)+6CO_(2) Heats of combustion of graphite and hydrogen at 300 K are -400 kJmol^(-1) respectively. If on combustion, 1 g of glucose releases 15 kJ of energy. calculate the heat of formation of glucose at 300 K.

Answer»

`-450` KJ
`1350` kJ
`-1350`kJ
`450` kJ

Answer :C
49.

Photosyntesis is a bio process by which planets make energy rich molecules from low energy molecules with the help of energy. From sunlight. The photosynthesis of glucose can be represented as : 6CO_(2)(g)+6H_(2)O(g)+hvrarrC_(6)H_(12)O(s)+60_(2)(g) Electrochemical oxidation of glucoses to CO_(2) and H_(2)O. which is the reverse of photosyhnthesis, is an impottaint reaction and it can be used in the construction of a fuel cell. In a fule cell, a working substance celled fule is electrochemiclly oxidised by O_(2) C_(6)H_(12)O_(6)+6HOrarr24_(e)^(-)+24H^(+)+6CO_(2) Calculate the approximate standard emf of this fuel cell at 27^(@)C if DeltaH^(@) and DeltaS^(@) of above photosynthesis reaction are -3xx10^(6)Jmol^(-1) and 200 JK^(-1)mol^(-1)respectively :

Answer»

`1.5` VOLT
1 volt
`4.5` volt
`3` volt

Answer :a
50.

Photonof wavelength4xx 10^(7)strikes onmetalsurfacethe workfunctionof the metal being2.13 eVCalculate(i) Theenergyof the photonev(ii)The kineticenergyof theemissionand(iii) thevelocityof thephotoelectron . (1 eV = 1.6020 xx 10^(19) J )

Answer»

Solution :`1 EV= 1.6020 XX 10 ^(19)|` where `lambda = 4 xx 10^(7) m`
`=(2.13 eVxx 1.6020 xx 10^(19)J)/( 1eV ) `
(i) Calculateof energyof photon
`E=- (hc)/( lambda ) = (6.626 xx 10^(34)J s) (3.0 xx 10^(8)ms^(-1))/(4XX 10^(7) m)`
(ii) Calculationof kineticenergyof emission
Kineticenergyof emission= (photonenergyworkfunctionW )
`=(4.9695xx 10^(19) - 3.4123 xx 10^(19)J`
(iii) Calculation ofvelocityof thephotoelectronkineticenergy`1.56 xx 10^(19) J`
Kineticenergy`=(1)/(2) MV^(2)`
`v^(2)= (2xx "kineticenergy")/( m )`
`=sqrt((2xx1.56 xx 10^(19))/(9.1 xx 10^(31) kg ))`
`= sqrt (0.3429 xx 10^(12) kg^(-1))`
`=0.5855 xx 10^(6) ms^(-1) `
`5.855 xx 10^(5) ms^(-1)`