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.

What do you mean by isoelectronic species ?

Answer»

SOLUTION :`F- (10 ELECTRONS),N^(3-), O^(2-), Ne ,Al^(3+),MG^(2+),Na^+`
Discussion
2.

Which of the following compounds will not evolve H_2 gas on reaction with alkali metals ?

Answer»

ethanoic acid
ethanol
phenol
none of these

Solution :All these compounds reacts with alkali METALS to EVOLVE HYDROGEN gas
Discussion
3.

What is the circumference of the second orbit of hydrogen atom?

Answer»

SOLUTION :`"CIRCUMFERENCE "= 2pir`
`"But R"=N^(2)xx0.529Å=2^(2)xx0.529Å=2.116Å`
`"Circumference "=2xx3.14xx2.116Å=13.3Å`
Discussion
4.

van der Walls forces are maximum in the following substance

Answer»

HBr
LiBr
LiCl
AgBr

Answer :D
Discussion
5.

Whichp , d , forbitalsare notpossible? Why ?

Answer»

SOLUTION :1p, 1D, 2D, 1F, 3f arenot possiblein shortdistance(r )suchorbitalsare notpossible .
Discussion
6.

Which of the following substances of lithium is most stable ?

Answer»

`LIF`
`LIBR`
`LICL`
`LII`

ANSWER :A
Discussion
7.

What will be the end peoduct (B) ?

Answer»

1,2-Dibromobenzene
1,3-Dibromobenzene
1,4-Dibromobenzene
1,2-Dibromobenzaldehyde

Answer :B
Discussion
8.

Transitional kinetic energy of a gas molecule________

Answer»

is constant at constant TEMPERATURE 
depends on QUANTITY of gas 
does not change with VOLUME at a given temp. 
is same for all gases at a given temperature 

Solution :Total `KE = 3/2 nRT`.
Discussion
9.

What are periodic properties ? Give example.

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Solution :The term PERIODICITY of properties indicates that the ELEMENTS with similar properties reappear at certain regular intervals of atomic number in the PERIODIC table.
Ex 1. Atomic radii,2. Ionisation energy
3. ELECTRON AFFINITY 4. Electron negativity.
Discussion
10.

What is the role of sodium carbonate in salt analysis

Answer»

Solution :Water and acid insoluble SALTS are FUSED with sodium CARBONATE. Sodium carbonate EXTRACT of the salt is then tested and qualitatively ANALYSED.
Discussion
11.

The value of e/m for an electron is

Answer»

`1.78xx10^(8)c//g`
`1.6724xx10^(-24)c//g`
`0.005486c//g`
`1.00866c//g`

ANSWER :A
Discussion
12.

Which of the following pair of orbitals possess two nodal planes

Answer»

`p_"xy", d_(x^2-y^2)`
`d_"xy", d_"zx"`
`p_"xy", d_"zx"`
`d_z^2 , d_(x^2-y^2)`

SOLUTION :`d_"xy"` and `d_"zx"` has TWO NODAL PLANES
Discussion
13.

Which of the following will not form an enolate?

Answer»




ANSWER :4
Discussion
14.

Which of the followingstatements regarding the inter molecular collisions in a gas is not correct

Answer»

DUE to INTER molecular collisions , directions of motion of molecules CHANGES
due to inter molecular collisions , the pressure of the gas will not change
due to inter molecular collisions , the velocities of individual molecules changes
due to inter molecular collisions , AVERAGE KINETIC energy of gas molecules changes .

Answer :D
Discussion
15.

Writethe electronicconfigurationof element withatomicnumbers89and 90and predictwhetherthey ared- orf- blockelements .

Answer»

Solution :Electronicconfigurationof Rn (Z =86) is`[Xe]^(54)4f^(14)5d^(10)6s^(2)6p^(6)`
Afterfilling6p- subshellfilling 7S- subshellstartsat Fr (Z= 87)= `[Rn]^(86)7s^(1)` and iscompleteat Ra `(z=88)= [Rn]^(86)7s^(2). ` Thereforethe fillingof 5f- subshellshould beginin ACCORDANCEWITH aufbauprinciple. But DUETO (i) stillsmallerenergydifference between5f- and 6d- orbitalsthan between4f- and5d- orbitalsand (ii)greaterstabilityof theradon core thenexttwo electrons(i.e.,89 thand 90 th)afterthefilling of 7s- orbitalsprefer to enter 6d- orbitalsbeforefillingthe 5f- ORBITALS. Thusthe electronicconfigurationare : `Ac (Z=89)= [ Rn]^(86)7s^(2)6d^(1)` andThe `(Z= 90)= [Rn ] ^(86)7s^(2)6d^(2)`
Hereagain theyshould becalledd- blockelementsbut arecalledf-blockelements becausethe INNER 5f- orbitalsare stillempty.
Discussion
16.

Which of the following reactions is classified as an ene reaction?

Answer»




Solution :REACTIONS (a) and (b) are both [3,3] sigmatropic REARRANGEMENTS, (C) an electrocyclic reaction, and (d) an ENE reaction.
Discussion
17.

when NaCI solution is added to Fe(OH)_3sol then :

Answer»

`[Fe(OH)_3]Fe^(3+)` is FORMED
`[Fe(OH)_3]CI^(_)` is formed
`[Fe(OH)_3]` is COAGULATED
`[Fe(OH)_3]Na^(+)` is formed

Answer :C
Discussion
18.

Which of the following statements is right

Answer»

All caboxylic acids exhibits functional isomers as esters
All alkynes exhibit chain isomerism
All ketones exhibit functional isomers as aldehydes
All ketones exhibit chain isomerism

Solution :For H - COOH no ESTER functional isomer. Alkynes to exhibit chain isomerism MINIMUM 5 CARBONS are NEEDED. Yes exhibit. For ecetone no chain isomerism
Discussion
19.

What is the Kelvin temperature or Absolute temperature ?

Answer»

SOLUTION :ABSOLUTE temperature is `0^(@)C` and KELVIN temperature is 273.15 K.
Discussion
20.

Which product is obtained in reaction of methanal in the presence of concentrated NaOH?

Answer»

`CO + H_(2)`
FORMIC acid
Formic acid
Methyl alcohol

Answer :C
Discussion
21.

Draw energy level diagram for He-2 molecule.Calculate its bond order.

Answer»

Solution :ATOMIC number of HELIUM is `2:1s^(2)`

(a) Electronic CONFIGURATION of `He_(2)` MOLECULE is `s1s^(2)s^(**)s1s^(2)`
(2) Bond ORDER `=(2-2)/(2)=0`
© Magnetic property = diamagnetic.
Discussion
22.

Which of the following is not a surfactant ?

Answer»

`CH_(3)-(CH_(2))_(15)-underset(CH_(3))underset(|) overset(CH_(3))overset(|)(N^(+))-CH_(3)Br^(-)`
`CH_(3)-(CH_(2))_(14)-CH_(2)-NH_(2)`
`CH_(3)-(CH_(2))_(16)-CH_(2)OSO_(2)^(-)Na^(+)`
`OHC-(CH_(2))_(14)-CH_(2)-COO^(-)Na^(+)`

SOLUTION :`CH_(3)-[CH_(2)]_(14)-CH_(2)-NH_(2)-a" " 1^(@)` AMINE is not a surfactant
Discussion
23.

Which of the following statements is correct for CsBr_(3) ?

Answer»

It is a COVALENT compound <BR>It CONTAINS `CS^(3+)` and `Br^(-)` ions
It contains `Cs^(+)` and `Br_(3)^(-)` ions
It contains `Cs^(+)`, `Br^(-)` and `Br_(2)` molecule.

Solution :`CsBr_(3)` contains `Cs^(+)` and `Br_(3)^(-)` ions.
Discussion
24.

Using stock notation, represent the following compounds: a. HAuBr_(4) ,b. Tl_(2)O ,c. FeO , d. Fe_(2)O_(3), e. CuBr, f. CuO g. MnO, h. MnO_(2)

Answer»

SOLUTION :
Discussion
25.

Which of the following statement(s) is/are correct?

Answer»

the system of constant entropy and constant volume will attain the equilibrium in a STATE of minimum energy
the entropy of the UNIVERSE is on the increase
the process would be spontaneous when `(Delta S_(E,V)) lt 0, (Delta E)_(S, V) GT 0`
The process would be spontaneous when `(Delta S)_(E, V) gt 0, (Delta E)_(S, V)lt 0`

SOLUTION :`Delta S_("universe") gt 0` for IRREVERSIBLE process for spontaneous process. `(DeltaS)_(E, V) gt 0 and (Delta E)_(S, V) lt 0`
Discussion
26.

Which type of electronic effects seen in structure of molecule?

Answer»

SOLUTION :(i) INDUCTIVE effect (ii) RESONANCE effect (iii) hyperconjugation effect. (iv) electromeric effect: In presence of REAGENT
Discussion
27.

What is difference between vapour and gas ?

Answer»

Solution :When temperature of GAS DECREASES than its `T_(C )` then its CONVERTED in to vapour. If we apply pressure liquification occurs.
Discussion
28.

What would be the molality of 20% (mass/mass) aqueous solution of Kl? (molar mass of Kl = 166 g mol^(-1))

Answer»

1.51
1.35
1.08
1.48

Answer :A
Discussion
29.

What is the oxidation number of the underlined atoms in each of the following molecules / ions ? (a)ulClO_3^(-) (b) ulBrF_3 (c) ulCH_4 (d) ulC_6H_(12)O_6 (e) Na_2ulB_4O_7 (f) Na_4|__Fe(CN)_6] (g) ulN_2H_4.

Answer»

Solution :Suppose x be the oxidation number of the UNDERLINED atom :
`{:((a),ClO_3^(-),x+(-2xx3)=-1),(,,x-6=-1" or "x=+5),((b),BrF_3,x+(-1xx3)=0),(,,x-3=0" or "x=+3),((c),CH_4,x+1(1xx4)=0),(,,x+4=0" or "x =-4),((d),C_6H_(12)O_6,6xxx+1xx12+(-2xx6)=0),(,,6x+12-12=0" or "x=0),((e),Na_4[FE(CN)_6],(+1xx2)+(xxx4)+(-2xx7)=0),(,,+2+4x-14=0 " or "x=+3),((f),Na_4[Fe(CN)_6],(+1xx4)+x+1(-1xx6)=0),(,,+4+x-6="or "x=+2),((G),N_2H_4,2x+4=0" or "x=-2):}`
Discussion
30.

Write Schrodinger wave equation in the briefest possible form

Answer»

Solution :`HAT(H) PSI = E Psi " where " hat(H)` is CALLED Hamiltonian OPERATOR.
Discussion
31.

Write the Lewis dot symbols and predict the valencies you expect for the following elements : Nitrogen , Fluorine and Neon

Answer»

SOLUTION :
Discussion
32.

Which of the following order is/are correct for the rate of E2 reaction ?

Answer»

5-Bromocycloheptene GT 4-Bromocycloheptene
2-Bromo-1-phenylbutane gt 3-Bromo-1-phenylbutane
3-Bromocyclohexene gt Bromocyclohexane
3-Bromo-2-methylpentane gt 2-Bromo-4-methylpentane

Answer :B::C::D
Discussion
33.

The work function for caesium atom is 1.9 eV. Calculate (a) the threshold wavelength and (b) the threshold frequency of the radiation. If the caesium element is irradiated with a wavelength 500 nm, calculate the kinetic energy and the velocity of the ejected photoelectron.

Answer»

Solution :(a) WORK function `(W_(0)) = h v_(0)`
`:. v_(0) = (W_(0))/(h) = (1.9 xx 1.602 xx 10^(-19)J)/(6.626 xx 10^(-34) Js) = 4.59 xx 10^(14) s^(-1) (1 EV = 1.602 xx 10^(-19)J)`
(B) `lamda_(0) = (c)/(v_(0)) = (3.0 xx 10^(8) ms^(-1))/(4.59 xx 10^(14) s^(-1)) = 6.54 xx 10^(-7) m = 654 xx 10^(-9) m = 654nm`
(c) K.E. of ejected electron `= h (v - v_(0)) = hc ((1)/(lamda) - (1)/(lamda_(0)))`
`= (6.626 xx 10^(-34) Js) (3.0 xx 10^(8) ms^(-1)) ((1)/(500 xx 10^(-9) m) - (1)/(654 xx 10^(-9) m))`
`= (6.626 xx 3.0 xx 10^(-26))/(10^(-9)) ((154)/(500 xx 654)) J = 9.36 xx 10^(-20)J`
K.E. `= (1)/(2) mv^(2) =9.36 xx 10^(-20) J or kg m^(2) s^(-2)`
`:. (1)/(2) xx (9.11 xx 10^(-31) kg) v^(2) = 9.36 xx 10^(-20) kg m^(2) s^(-2)`
or `v^(2) = 2.055 xx 10^(11) m^(2) s^(-2) = 20.55 xx 10^(10) m^(2) s^(-2) or v = 4.53 xx 10^(5) ms^(-1)`
Discussion
34.

Which has the maximum viscosity ?

Answer»

Water 
Glycol 
ACETONE 
ETHANOL 

Answer :B
Discussion
35.

What happens whensodium peroxide dissolves in water?

Answer»

SOLUTION :`Na_2O_2+2H_2O RARR 2NaOH+H_2O_2`
Discussion
36.

Which law of thermodynamics deals with equivalence of different forms of energies?

Answer»

SOLUTION :FIRST LAW of THERMODYNAMICS.
Discussion
37.

The root mean square velocity of an ideal gas at constant pressure varies with density d as

Answer»

`d^(2)`
d
`SQRT(d)`
`1//sqrt(d)`

ANSWER :D
Discussion
38.

Which carbide liberates methane gas on hydrolysis

Answer»

`Be_(2)C`
`AI_(4)C_(3)`
Both (a) and (B )
All the above

Solution :`Be_(2)C + 2H_(2)O rarr 2BeO + CH_(4)`, Methane gas was PRODUCED so `Be_(2)C` is also called methanoid
Discussion
39.

Which of the following structure is least stable?

Answer»




All are equally stable

Solution :STRUCTURE a is unstable because have positive CHARGE is PRESENTON C carrying -I group which will further intensity (locative ) the charge makingthe species unstable.
Discussion
40.

The solution in water sulphates down theBe group is : Be gt Mg gt Ca gt Sr gt Ba . This is due to

Answer»

INCREASE in MELTING GROUP
increase in ionization energy
decreasing lattice energy
decreasing HYDRATION enthalpy .

Solution :Decreasing hydration enthalpy .
Discussion
41.

Which of the following compounds will produce butanone when treated with H_(2)SO_(4) , HgSO_(4) and water?

Answer»

`CH_(3)-CH_(2)-CH=CH_(2)`

`CH_(3)-CH_(2)-CH_(2)-C-=N`

ANSWER :B
Discussion
42.

Which of the following expression for equilibrium constant of the reaction 2N_2O_((g)) + O_(2(g)) hArr 4NO_((g)) ?

Answer»

`([N_2][O_2])/[NO]^4`
`[NO]^4/([N_2O]^2[O_2])`
`([N_2O]^2[O_2])/[NO]^4`
`[NO]^4/([N_2O])`

ANSWER :B
Discussion
43.

What will be the pressure of 10 gram of a gas kept under atmospheric pressure, if its temperature is changed from 546 K to 273 K ?

Answer»

`(1)/(2)` BAR
273 bar
2 bar
`(1)/(273)` bar

Solution :Initial temperature `= T_(1)=546` Kelvin
Initial pressure = ATMOSPHERIC pressure `= P_(1)=1` bar Final temp. `= T_(2)=273` Kelvin.
Final pressure `= P_(2)=`
According to Gay Lucca.s Law :
`P prop T` (n.V constant) So, the temperature will be 273 K from 546 K. Means if we half it, them the pressure will also be halved, it will be `(1)/(2)` bar from 1 bar.
OR
`(P_(1))/(T_(1))=(P_(2))/(T_(2))` (n.V constant)
`therefore ("1 bar")/("546 kelvin")=(P_(2))/("273 kelvin")`
`therefore P_(2)=("273 kelving" xx"1 bar")/("546 kelvin")=(1)/(2)` bar
Discussion
44.

what is the distance betweenNa^(+) and Cl^(-)in a NaCl crystal if its density is 2.165"g cm"^(-3)? NaCl crystallises in the fcc lattice.

Answer»


ANSWER :250 PM
Discussion
45.

To a solution of excess of KI in dilute H_(2)SO_(4). 25 mL of an unknown solution of KMnO_(4) were added. The liberated iodine was exactly reduced by 42.5 mL of N//10 Na_(2)S_(2)O_(3) solution. Calculate the concentration of KMnO_(4) solution.

Answer»


SOLUTION :N//A
Discussion
46.

Which will show geometrical isomerism?

Answer»




SOLUTION :N//A
Discussion
47.

Which one of the following molecules has the smallest bond angle ?

Answer»

`NH_(3)`
`PH_(3)`
`H_(2) S`
`H_(2) SE`

ANSWER :D
Discussion
48.

Which of the following is not a redox reaction?

Answer»

`H_(2) + F_(2) to 2HF`
`Cu + 4HNO_(3) to Cu(NO_(3))_(2) + 2NO_(2) + 2H_(2)O`
`2H_(2) + O_(2) to 2H_(2)O`
`AgCl + NH_(3) to [AG(NH_(3))_(2)]CL`

Answer :D
Discussion
49.

What is theelectronicconfigurationof the elementwith (i)Z= 57 . Is ita d- orf- blockelement ?

Answer»

Solution :As explainedin the foot thenote onpage`3//14`the electronicconfigurationof
` ( La = 57 ) " is"1 s^(2)2S^(2)2p^(6) 3S^(2)3p^(6)3d^(10)4s^(2)4p^(6)4d^(10)5s^(2)5s^(6) 6S^(2)5d^(1)`
instead of the EXPECTED `1s^(2)2s^(2) 2p^(6) 3s^(2) 3p^(6)3d^(10) 4s^(2) 4p^(6) 4d^(10) 5s^(2) 6s^(2) 4f^(1)`
Sincethe lastelectronenters the 5d- orbitalit is calledd- blockelementand not thef-blockelement .
Discussion
50.

The well known antipyretic 2-Acetoxy benzoic acid is obtained when

Answer»

Salicylic acid is treated with phenol in the PRESENCE of `POCl_(3)`
Salicylic acid is treated with ACETIC anhydride in the presence of few drops of conc. `H_(2)SO_(4)`
Phenol is treated with methyl ALCOHOL in the presence of `H_(2)SO_(4)`
None of the above

Solution :
Discussion