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.

Write equation of Dipole moment.

Answer»

SOLUTION :Dipole moment = CHARGE `xx` distance
R = Q (coulomb `xx` r (METER)
`thereforer = Q xx r " Cm" `here, Cm = coulomb meter
`therefore r = Q xx r "Cm " `here, Cm = coulomb meter
Discussion
2.

what is the nature of the reaction for the following ? DeltaGgt0

Answer»

Solution :`DELTAGGT0` : The process in NON -spontaneous and non - FEASIBLE
Discussion
3.

Which alkali metal emits longest wavelength light in flame test ?

Answer»

Na
K
Cs
Li

SOLUTION :Actually Rb EMITS the longest wavelength LIGHT in FLAME test . Since Rb is not ONE of the options , therefore , answer is K
Discussion
4.

Total number of stereoisomeric products obtained by addition of bromine to 2-pentene.

Answer»


SOLUTION :FOUR ISOMERIC PRODUCTS
Discussion
5.

Which of the following is used as a moderator in nuclear reactors ?

Answer»

HARD water
Heavy water
Deionized water
Mineral water.

Answer :B
Discussion
6.

The vant Hoff factor (i) for a dilute solution of potassium aluminium sulphate is

Answer»

4
5
3
unpredictable

Solution :KAI `(SO_(4))_(2) to K^(+) + Al^(3+)+2SO_(4)`
No. of IONS PRODUCED `=4 THEREFORE i=4.0`
Discussion
7.

Two elements X and Y have atomic weight of 14 and 16 . They form a series of compounds , A , B , C with fixed mass of X , Y is present in the ratio 1 :2 : 3 : 4 : 5 . If the compound A has 28 parts by weight of X and 16 parts by weight of Y , then the compound C will have 28 parts by weight of X and

Answer»

32 parts by weight of Y
48 parts of weight of Y
64 parts by weight of Y
80 parts of weight of Y

Answer :B
Discussion
8.

Which of the following activates the benzene ring most towards electrophilic substitution ?

Answer»

`-CHO`
`-NR_2`
`-NHCOCH_3`
`-NO_2`

ANSWER :B
Discussion
9.

Which pair of isomers given below are positional isomers

Answer»

Propanal and propanone
`1^@` BUTYL ALCOHOL and ISOBUTYL alcohol
`3^@`butyl alcohol and Isobutyl alcohol
`2^@ `Butyl alcohol and `3^@`Butyl alcohol

Solution :
Discussion
10.

Water and hydrogen peroxide illustrate the law of

Answer»

A. CONSTANT PROPORTIONS
B.multiple proportions
C. isomorphism
D.reciprocal proportions

Answer :B
Discussion
11.

What is the product obtained when chlorine reacts with ethyl alcohol in the presence of NaoH?

Answer»

`CH_(3)Cl`
`C_(2)H_(2)Cl`
`C Cl_(3).CHO`
`CHCl_(3)`

Solution :When chlorine reacts with ethyl alcohol in the presence of `NaOH`, chloroform is obtained as a final product.
`UNDERSET("Ethanol")(CH_(3)CH_(2)OH)+Cl_(2)overset("Oxidation")rarrunderset("Acetaldehyde")(CH_(3)CHO+2HCl)`
`CH_(3)CHO+3Cl_(2)overset("CHLORINATION")rarr underset("CHLORAL")(C Cl_(3)CHO+3HCl)`
`C Cl_(3)CHO+NaOH overset("Hydrolysis")rarr underset("Chloroform")(CHCl_(3))+underset("Sod. formate".)(HCOONA)`
Discussion
12.

What are representative elements? Give their valence shell configuration

Answer»

<P>

ANSWER :s' and 'p' BLOCK ELEMENTS `ns^2,ns^2 NP^(1-6)`
Discussion
13.

What will be the pressure of the gaseous mixture when 0.5 L of H_(2) at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1L vessel at 27^(@)C?

Answer»

SOLUTION :SUPPOSE the partial pressures of `H_2 and O_2` in the GAS mixture are `p_1 and P_2` respectively.
For `H_2 " gas : " P_1 V_1 = P_2 V_2`
`0.8 xx 0.5 = P_1 xx 1 or P_1 = (0.8 xx 0.5)/1 = 0.4` bar
For `O_2 " gas : " 0.7 xx 2.0 = P_2 xx 1`
or `P_2 = (0.70 xx 2.0)/1 = 1.4` bar
Hence, the total pressure of the gas mixture = `0.4 +1.4 = 1.8` bar
Discussion
14.

Which one is more closerto nucleusin 4s^(2)and 3d^(10)4s^(0)and 3d^(10)

Answer»

SOLUTION :`3D^(10)`and `4S^(0)` is morecloseto nucleusthen `4s^(2)` and`3d^(10)`
Discussion
15.

What is DDT? How is it prepared?

Answer»

Solution :(i) DDT is p, p.-dichloro-diphenyl-trichloroethane
(ii) DDT can be prepared by HEATING a mixture of chloro BENZENE with CHLORAL in the presence of CONC. `H_2SO_4`
Discussion
16.

What is the colour change at the end point in the titration of oxalate ions against MnO_4^-

Answer»

SOLUTION :Colourless solutions TURNS PALE PINK.
Discussion
17.

Which one of the following is not a colloidal solution:-

Answer»

Smoke
Ink
AIR
Blood

SOLUTION :Air is not a COLLOIDAL solution because it is a HOMOGENOUS MIXTURE.
Discussion
18.

What percentage of solution of H_(2) O_(2)is called as "100 - Volume "H_(2) O_(2)

Answer»

0.15
0.5
0.2
0.3

Answer :C
Discussion
19.

Using MO theory, explain why cyclobutadiene is antiaromatic. Strategy: Use the polygon-and-circle method for deriving the relative energies pi MOs.

Answer»

Solution :
The MO ELECTRON DISTRIBUTION is Since the nonbonding `MOs` are half-filled, CYCLOBUTADIENE isantiaromatic.
Discussion
20.

Which of the following is not the use to calcium ?

Answer»

Used in chewing gum
Used to MANUFACTURE cement
Used in manufacture high QUALITY paper
Used to preserve MEAT and fish

Answer :D
Discussion
21.

What is the symbol for SI unit for electric current ?

Answer»

s
Amp
A
Cd

Answer :A::C
Discussion
22.

Which of the following alkyl groups is more powerful electron donating group when they are attached to unsaturated carbon

Answer»

`-CH(CH_(3))_(2)`
`-CH(CH_(3))C_(2)H_(5)`
`-CH_(3)`
`-CH(CH_(3))_(3)`

SOLUTION :Due to more number of hyper conjugation STRUCTURE.
Discussion
23.

Which diseases cause by SO_2 ?

Answer»

Asthma
Swelling
IRRITATION to EYES
All of these

Solution :All of these
Discussion
24.

Use the following data to calculate Delta_("lattice") H^( Theta ) for NaBr. Delta_("sub") H^( Theta ) for sodium metal = 108.4 "kJ mol"^(-1), ionization enthalpy of sodium =496 "kJ mol"^(-1), electron gain enthalpy of bromine = - 325 "kJ mol"^(-1), bond dissociation enthalpy of bromine = 192 "kJ mol"^(-1) Delta_(f) H^( Theta )for NaBr_((s)) = - 360.1 "kJ mol"^(-1).

Answer»

SOLUTION :Given that, `Delta_("sub") H^( THETA )` for `Na` metal `= 108.4 "kJ mol"^(-1)" IE"` of `Na= 496 "kJ mol"^(-1) , Delta_("eg") H^( Theta )` of `BR = - 325 "kJ mol"^(-1), Delta_("DISS") H^( Theta )` of `Br = 192 "kJ mol"^(-1) , Delta H^( Theta )` for `NaBr = - 360.1 "kJ mol"^(-1)`
Born-Haber cycle for the formation of NaBr is as

By applying Hess.s law,
`Delta_(f) H^( Theta )= Delta_("sub") H^( Theta ) + "IE" +Delta_("diss") H^( Theta ) + Delta_("eg") H^( Theta ) + U - 360.1 = 108.4 + 496 + 96 + (-325) - U`
`U= + 735.5 "kJ mol"^(-1)`
Discussion
25.

What do you understand by bond pairs and lone pairs of electrons ? Illustrate by giving one example of each type .

Answer»

Solution :Covalent BONDS are formed by mutual sharing of elecrons between the two atoms . The shared pairs of
electrons THUS present between the BONDED atoms are called bond pairs.
All the electrons of an atom MAY not participate in the bonding . The electron pairs present on the atoms
which do not take in bonding are called lone paris of electrons . For example ,in` CH_(4)(H:overset(H)overset(. .)underset(. .)C:H)`,
there are only 4 bond pairs in ` H_(2) OCH_(4)(H:overset(. .)underset(. .)C:H)` , there are two bond pairs and two lone pairs .
Discussion
26.

The types of hybridiration on the five carbon atom from right to left in the , 2,3 pentadiene.

Answer»

`SP^(3),sp^(2),sp,sp^(2),sp^(3)`
`sp^(3), sp, sp, sp, sp^(3)`
`sp^(2), sp,sp^(2),sp^(2), sp^(3)`
`sp^(3), sp^(3), sp^(2), sp^(3),sp^(3)`

Solution :`OVERSET(sp^(3))(CH_(3))-overset(sp^(2))(CH)=overset(sp)(C)= overset(sp^(2))(CH)-overset(sp^(3))(CH_(3))`
Discussion
27.

What is meant by positive and negative deviations from Raoult's law and how is the sign of Delta H _(mix) related to positive and negative deviations from Raoult's law?

Answer»

Solution :NEGATIVE deviations: In these type of deviations, the partial vapour pressure of each component A and B of solution is HIGHER than the vapour pressure calculated from Raoult.s law. For example: Water and ethanol, chloroform and water.
POSITIVE deviations: In case of positive deviation A-B interactions are weaker than those between A-A or B-B. This means that in such solutions molecules or A (or B) will find it EASIER to positive deviation fromRaoult.s law.
Discussion
28.

Which of the following can adsorb largest volume of hydrogen gas ?

Answer»

Finely DIVIDED PLATINUM
Finely divided nikel
COLLOIDAL PALLADIUM
Colloidal platinum.

Solution :Order of adsorption of `H_(2)` (occulsion) is Colloidal Palladium `gt "Palladium" gt "Platinum" gt ........"Gold" gt "Nickel"`.
Discussion
29.

Total stereoisomer of the compound Cortisone is :

Answer»

32
64
66
128

Solution :N//A
Discussion
30.

Total stereoisomer of the compound Cortisone is :

Answer»

4
5
6
7

Solution :N//A
Discussion
31.

What is the difference between resonance structure of CH_(3)CH_(2)COO^(-) and CH_(3)COOH ?

Answer»

Solution :In DIFFERENT structure of `CH_(3)CH_(2)COO^(-)` the DISPERSION of NEGATIVE charge and all are negative ion. In resonance structure of `CH_(3) COOH`, the POLARITY is produced by separation of charge.
Discussion
32.

What type of particles are emitted by Tritium?

Answer»


ANSWER :`BETA^(-)` (beta NEGATIVE)
Discussion
33.

Write resonance structures of CH_(3)COO^(-) and show the movement of electrons by curved arrows.

Answer»

SOLUTION :
These are RESONANCE STRUCTURES SINCE these differ in the position of electrons and not atoms.
Discussion
34.

Which of the two is expected to be more stable and why ? O_(2) NCH_(2) CH_(2) overset (bar)O " (or )" CH_(3) CH_(2) overset(bar)O

Answer»

SOLUTION :`square O_(2) NCH_(2) CH_(2) overset (bar)O ` is expaected to be more stable than ` CH_(3) -CH_(2) - overset(bar) O `
` square -NO_(2) ` has -I effect , this leads to the DISPERSAL of NEGATIVE charge.
` square ` On the other hand `-CH_(3)` group has +I effect which intensity the negative charge .
` square therefore ` Dispersalof charge leads to the stability of ion and intensification of negative charge leads to unstailiy of ion.
`{:(O_(2)N LARR CH_(2) larr CH_(2) - overset (bar)O ,"More stable "),(CH_(3)rarrCH_(3) rarr overset (bar)O,"Less stable "):}`
Discussion
35.

Whichof thefollows indicatesdeficiencyofpotassiumin human body ?

Answer»

Paralysisof MUSCLES
Retardedbonegrowth
Reductionin fatgrowth .
Lowblood PRESSURE

ANSWER :A
Discussion
36.

What happens when (a) Borax is heatedstrongly, (b) Boric acid is added to water, (c ) Aluminium is treated wi th dilute NaOH, (d) BF_(3) is reacted with ammonia ?

Answer»

Solution :(a) When borax is heatedstrongly, a transparentglassybead which consis of sodium METABORATE `(NaBO_(2))` and boric anhydride is formed
`UNDERSET(" Borax ")(Na_(2)B_(4)O_(7).10H_(2))overset("Heat")rarrNa_(2)B_(4)O_(7) + 10H_(2)O`

(b) Boric act as a weak LEWIS ACID by accepting a hydroxideion of waterand releasing a proton the solution.

(c ) Dihydrogen is evolved.
`2Al (s) + 2NaOH(aq) + 6H_(2)O(l) rarr 2Na^(+) [Al(OH)_(4)]^(-) + 3H_(2)(g)`
(d) `BF_(3)` beinga Lewisacid accepts a PAIR of electrons from `NH_(3)`to form the corresponding complex.
Discussion
37.

Whichone fo the follownigis not an ortho para director

Answer»

`-NO_(2)`
`-CH_(3)`
`-OH`
`-C_(2)H_(5)`

Answer :a
Discussion
38.

Which is helpful in the formation of ionic bond

Answer»

Only SMALL cation
Only small anion
Small cation and small anion both
Low positive charge, large cation and small anion

Solution :For ionic bond FORMATION low I.E. High ELECTRON AFFINITY and high lattice energy is NEEDED.
Discussion
39.

Two moles of an ideal gas is expanded isothermally and reversibly from 1 litre to 10 litre at 300 K. The internal energy change (in kJ) for the process (R = 8.3J)

Answer»

11.4 KJ
`-11.4 KJ `
`0 KJ`
`– 4.8 KJ`

ANSWER :C
Discussion
40.

Zinc dust in alcoholic solution is a specific reagent in the preparation of alkenes as a

Answer»

Dehydrohalogenating AGENT
DEHYDRATING agent
Dehydrogenating agent
Dehalogenating agent

ANSWER :D
Discussion
41.

When ethanol dissolves in water, which of the following is observed?

Answer»

Absorption of heat and DECREASE in volume
Absorption of heat and increase in volume
Emission of heat and increase in volume
Emission of heat and increase in volume

Solution :NEW inter-molecular FORCESS between `C_(2)H_(5)OH` and `H_(2)O` molecules are WEAKER than the the old intermolecular FORCES between `H_(2)O-H_(2)O` molecules and `C_(2)H_(5)OH-C_(2)H_(5)OH` molecules. As such `Delta H_(max)` and `Delta V_(mix)` are both positive.
Discussion
42.

Which one of the following has lowest ionisation energy-

Answer»

`1s^(2)2s^(2)2p^(6)`
`1s^(2)2s^(2)2p^(6)3s^(1)`
`1s^(2)2s^(2)2p^(5)`
`1s^(2)2s^(2)2p^(3)`

Solution :The electronic configuration `1s^(2)2s^(2)2p^(6)3s^(1)` is that of an alkali metal. In a certain period of the PERIODIC table, ionisation potential of alkali METALS is the lowest.
Discussion
43.

Which has the highest melting point ?

Answer»

Si
Pb
Sn
C

Answer :D
Discussion
44.

Which of the following is not hydrolysed easily

Answer»

`C Cl_(4)`
`SiCl_(4)`
`GeCl_(4)`
`SnCl_(4)`

Answer :A
Discussion
45.

What is CHN in organic estimation?

Answer»

Solution :It is a AUTOMATIC EXPERIENTIAL technique in which the ELEMENT, carbon hydrogen and nitrogen present in a compound are DETERMINED by and apparatus known as CHNelements of analysis
Discussion
46.

What is the mass in grams of a hydrogen chloride, HCl?

Answer»

Solution :The molecular weight of HCL equal to the atomic weight of H, plus the atomic weight of Cl, (ie) (1.01 + 35.5) amu = 36.5 amu. Therefore 1 mol of HCl contains 36.5 G HCl
Mass of HCl MOLECULE `=(36.5 g)/( 6.02 xx 10^(23))`
`= 6.06 xx 10^(-23)g`
Discussion
47.

Write the structure of an anion which is isostructural with BF_(3)and the structure of a cation which is Isostural with CH_(4)

Answer»

SOLUTION :(i)` NO_(3)^(-)` (Triangular PLANAR) (ii) ` NH_(4) ^(+)` (terachedral )
Discussion
48.

The wavelength of a blue light is 4800Å. Calculate the frequency and wave number of this light.

Answer»

Solution :Given that `c = 3 xx 10^(8)ms^(-1)`
`lambda=4800Å=4800xx10^(-10)m=4.8xx10^(-7)m`
`"V = frequency = ? "`
`"Using the RELATION"upsilon=(c )/(lambda)=(3xx10^(8))/(4.8xx10^(-7)m)`
`=6.25xx10^(14)s^(-1) or 6.25xx10^(14)Hz`
`"The wave number is the reciprocal ofwavelength "=bar(upsilon)=(1)/(lambda)=(1)/(4.8xx10^(-7)m)=2.0833xx10^(6)m^(-1)`
`"Thus frequency of blue light is "6.25 xx 10^(14) Hz`
`"Waveumber of blue light is "2.0833 xx 10^(6) ml`
Discussion
49.

Which of the following statements is true for a catalyst

Answer»

It increases the ENERGY of the reactant
it decreases the energy of the products
It decreases the energy of the reactants
It does not change the ENTHALPY of the reactants

Solution :Catalyst does not DEPEND on the enthalpy of the reactants.
Discussion
50.

Which of the following is an intensive property : Surface tension, mass, volume, enthalpy, density?

Answer»

SOLUTION :SURFACE tension and density are INTENSIVE PROPERTIES.
Discussion