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.

Choose the correct match.

Answer»

`18mlH_(2)O` at `4^(@)C` contains `6.023xx10^(24)` electrons
11200 ml of `CO_(2)` at STP contains `6.023xx10^(23)` OXYGEN atoms.
5600ml of `CH_(4)` at 273 K and 2 atm contains `12.04xx10^(23)` hydrogen atom.
5600 ml of `CH_(4)` at STP contains `1.505xx10^(23)` METHANE molecules.

Solution :a) 18 ml implies 18 gm = 1 mole = 10 moles of `e^(-)`
b) 11200 ml = 0.5 moles of `CO_(2)`
= 1 moles of O atoms
c) 5600 ml at 2 atm implies 11200 at 1 atm
= 0.5 moles of `CH_(4)=4xx0.5`
= 2 moles of H atoms
d) 5600 ml at STP implies 0.25 moles of `CH_(4)` molecules
Discussion
2.

Choose the correct enol content order of the following compounds in their pure liquid state I) CH_(3)COCH_(3)II) CH_(3)COCH_(2)COOC_(2)H_(5)III) C_(6)H_(5)COCH_(2)COOC_(2)H_(5) IV) CH_(3)COCH_(2)COCH_(3)V) C_(6)H_(5)COCH_(2)COCH_(3)

Answer»

II gt III gt IV gt I gt V
III gt II gt I gt V gt IV
V gt IV gt III gt II gt I
V gt III gt IV gt II gt I

Solution :
Discussion
3.

Choose the correct answer.A thermodynamic state function is a quantity

Answer»

USED to DETERMINE heat changes
whose value is independent of path
used to determine PRESSURE volume work
whose value DEPENDS on TEMPERATURE only
Discussion
4.

Choose the correct answerWho proposed the dual nature of light to all forms of matter?

Answer»

JOHN Dalton
Neils Bohr
Albert EINSTEIN
J.J. Thomson

Answer :C
Discussion
5.

Choose the correct answerWhich one of the following is the time independent Schrodinger wave equation?

Answer»

`/_\x./_\pgt=H/(4PI)`
`(del^(2)PSI)/(delx^(2))+(del^(2)Psi)/(dely^(2))+(del^(2)Psi)/(delz^(2))+(8pi^(2)m)/(h^(2))=0`
`(del^(2)Psi)/(delx^(2))+(del^(2)Psi)/(dely^(2))+(del^(2)Psi)/(delz^(2))+(8pi^(2)m)/(h^(2))(E-V)Psi=0`
`HAT(H)Psi-Epsi=-(8pi^(2)m)/(h^(2))`

ANSWER :C
Discussion
6.

Choose the correct answerWhich one of the following is the Correct increasing order of the effective unclear Charge felt by an electron ?

Answer»

`sgtpgtdgtf`
`sltpltdltf`
`sgtpgtfgtd`
`fltpltdlts`

ANSWER :A
Discussion
7.

Choose the correct answerWhich of the following provides the experimental justification of magnetic quantum number?

Answer»

ZEEMAN EFFECT
STARK effect
Uncertainty principle
Quantum condition

Answer :A
Discussion
8.

Choose the correct answerWhich of the following is the expected configuration of Cr (Z = 24)?

Answer»

`1s^(2)2S^(2)2P^(6)3s^(2)3p^(6)3d^(4)4s^(2)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(1)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(6)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(3)`

Answer :A
Discussion
9.

Choose the correct answerWhich of the following is the actual configuration of Cr (Z = 24)?

Answer»

`1s^(2)2s^(2)2P^(6)3s^(2)3p^(6)3d^(4)4s^(2)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(1)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(6)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(3)`

ANSWER :B
Discussion
10.

Choose the correct answerWhich of the following experiment proves the presence of an electron in an atom

Answer»

Rutherford's x-ray SCATTERING experiment
DAVISSON and Germer experiment
J.J. Thomson cathode ray experiment
G.P. Thomson GOLD FOIL experiment

Answer :C
Discussion
11.

Choose the correct answerWhich of the following is not use in writing electronic configuration of an atom?

Answer»

AUFBAU PRINCIPLE
Hund's rule
Pauli's EXCLUSION principle
HEISENBERG's UNCERTAINTY principle

Answer :D
Discussion
12.

Choose the correct answerWhat are the values of n,l, m and s for 3Px electron?

Answer»

3,2,1,0
3,1,-1,+1/2
3,2,+1, -1/2
3,0,0,+1/2

Answer :B
Discussion
13.

Choose the correct answer in each of the followingand explain with reason(i)NaCl, KCl, MgCl_(2), CaCl _(2)- most ionic (ii) Ba to Ba^(2+)-, Be to Be^(2+), Cs to Cs^(+), Li^(+)-maximum ionization energy (iii)AlCl_(3), All_(3), MgI_(2), NaI - most covalent (iv) RbF, CsF, NaF, KF - highest lattice energy (v)Li^(-), Be^(-), B^(-), C^(-) - least stable species (vi)CIO_(3) ,XeF_(4), SF_(4), I_(3)^(-) - maximum number of lone pairs of electrons on central atom

Answer»

Solution :(i) KCl - on the basis of Fajan's rule that larger the size of the cation greater is the ionic bonding . Here , the
cation ` K^(+)`has largestsize (anion `Cl^(-)` is same in all cases )
(ii) ` Be to Be^(2+)` has MAXIMUM ionization energy becausesmaller the atom , more is the energy needed to
remove the electron, i.e., ionization energy , Also , removal of two electrons requires more energy .
(iii) `AII_(3)` on the basis of Fajan's rules
(IV) `Be^(-)`- This is becuae`Li^(-) = 1s^(2) 2x^(2), Be^(-) =1s^(2) 2s^(2)SP^(1)` In `Li^(-)`, addition of electron has taken place in 2s
orbital . In ` Be^(-)` , addition of electron has taken place in 2p orbital leaving its 2s orbital COMPLETELY filled
`EA_(1)` for Beis more positivethen ` EA_(1) for Li` . Thus , ` Be^(-)` is LEAST stable
(vi) ` I_(3)^(-)`- No of lone pairs of electrons are ` I_(3)^(-) = 3 ,XeF_(4) = 2, SF_(4) = 1, CIO_(3)^(-) = 1 `
Discussion
14.

Choose the correct answerIdentify the quantum number for 4dx2-y2 electron

Answer»

4,2,-2, +1/2
4,0,0,+1/2
4,3,2,+1/2
4,3,2,-1/2

Answer :A
Discussion
15.

Choose the correct answerHow many Orbitals are possible in 3rd energy level?

Answer»

16
9
3
27

Answer :B
Discussion
16.

Choose the correct answer for the reaction,N_2(g) +3H_2(g) -> 2NH_3(g), Delta_rH = -91.8 kJmol^-1The concentration of H_2(g) at equilibrium can be increased by

Answer»

LOWERING the temperature
Increase the volueme of the system
Adding `N_2` at CONSTANT volume.
Adding `H_2` at constant volume

Answer :A::B::D
Discussion
17.

Choose the correct answer. A thermodynamic state function is a quantity (i) used to determine the heat changes (ii) whose value is independent of path (iii) used to determine pressure - volume work (iv)whose the value depends on temperature only.

Answer»

SOLUTION :WHOSE VALUE is INDEPENDENT of PATH
Discussion
18.

Choose the correct alternative (more than one may be correct)(B.M.C.=Bimolecular collision)(at constantV) (n-is constant throughout).

Answer»

`LAMBDA` is constant.
BMC made by 1 molecule per second is directly PROPORTIONAL to `sqrt(P)`.
BMC for all the MOLECULES per UNIT volume is directly proportional to `T^(3//2)`
None of the above

Answer :ab
Discussion
19.

Choose the correct answer. A thermodynamic state function is a quantity....

Answer»

used to determine HEAT changes.
whose VALUE is INDEPENDENT of path.
used to determine PRESSURE volume work.
whose value depends on TEMPERATURE only.

Answer :B
Discussion
20.

Choose incorrect option(s) for the given reaction:

Answer»

`A(s)+B(g)hArrC(g)`: At equilibrium, if pressure is INCREASED, no effect on equilibrium.
`X(g)hArrY(g)+Z(g)`,If total pressure of the system is DECREASED at equilibrium,it will shift in forward DIRECTION.
`H_2O(g)+CO(g)hArrH_2(g)+CO(g)`,inert gas is added at CONSTANT volume at equilibrium,so total pressure will increase and no effect on equilibrium.
`H_2O(g)+CO(g)hArrH_2(g)+CO(g)`,inert gas is added at constant volume at equilibrium,so total pressure will increase and no effect on equilibrium.

Answer :A::D
Discussion
21.

Choose correct statements (s) regarding the following reactions. Cr_(2)O_(7)^(2-)(aq)+3SO_(3)^(2-)(aq)+8H^(+) rarr 2Cr^(3+)(aq)+3SO_(4)^(2-)(aq)+4H_(2)O

Answer»

`Cr_(2)O_(7(aq))^(2-)+3SO_(2(g))+2H_((aq))^(+)rarr 2Cr_((aq))^(3+) rarr 2Cr_((aq))^(3+)+3SO_(4(aq))^(2-)+H_(2)O_((l))`
`2Cr_(2)O_(7(aq))^(2-)+3SO_(2(g))+4H_((aq))^(+)rarr 4Cr_((aq))^(3+)+3SO_(4(aq))^(2-)+2H_(2)O_((l))`
`Cr_(2)O_(7(aq))^(2-)+3SO_(2(g))+14H_((aq))^(+)rarr 2Cr_((aq))^(3+)+3SO_(4(aq))^(2-)+7H_(2)O_((l))`
`Cr_(2)O_(7(aq))^(2-)+6SO_(2(g))+7H_((aq))^(+)rarr 2Cr_((aq))^(3+)+6SO_(4(aq))^(2-)+7H_(2)O_((l))`

Solution :`Cr_(2)O_(7)^(2-)+SO_(2)rarrCr^(3+)+SO_(4)^(2-)` ( in acidic solution)
OXIDATION half equation :
`SO_(2)+2H_(2)O rarr SO_(4)^(2-)+4H^(+)+2e^(-)`...(i)
Reduction half equation :
`Cr_(2)O_(7)^(2-)+14H^(+)+6e^(-)rarr 2 Cr^(3+)+7H_(2)O` ...(II)
MULTIPLYING eqn. (i) by 3 and adding to eqn. (ii) we get
`Cr_(2)O_(7)^(2-)+3SO_(2)+2H^(+) rarr 2 Cr^(3+)+3SO_(4)^(2-)+H_(2)O`
Discussion
22.

Choose correct ordect orders:

Answer»

`BeSO_(4)ltMgSO_(4)LT CaSO_(4)ltSrSO_(4)ltBaSO_(4)`
(enthalpy of solution )
`Ca(OH)_(2)ltSr(OH)_(2)("solubility") BeCO_(3)gtMg CO_(3)`
`gtCaCO_(3)("THERMAL stability ")`
`NaO_(2)gtKO_(2)("stability")`

Answer :1
Discussion
23.

Choose correct option to match column-A with column-B

Answer»

`(i) rarr d, (ii) rarr f, (iii) a, (iv) rarr b`<BR>`(i) rarr d, (ii) rarr c, (iii) E , (iv) rarr f`
`(i) rarr e, (ii) rarr g, (iii) f, (iv) rarr e`
`(i) rarr d, (ii) rarr g, (iii) f, (iv) rarr e`

Solution :(i) `CH_(3)CH_(2)Cl + KOH_((aq)) rarr underset("ethanol(d)")(CH_(3)CH_(2)OH) + KCl`
(ii) `underset("n-butane")(CH_(3)CH_(2)CH_(2)CH_(3)) overset(AlCl_(3))rarr underset("isobutane(g)")(CH_(3)- underset(underset(CH_(3))(|))(CH)-CH_(3))`
(iii) `CH_(3)CH_(2)Br + KOH overset("alcohol")rarr underset("ethene")(H_(2)C=CH_(2)) + KBr + H_(2)O`
(iv) `CH_(2)=CH_(2) + Cl_(2) rarr CH_(2)Cl - CH_(2)Cl` 1, 2-di-chloro ethane (e)
Discussion
24.

Choose correct option by identifyingX, Y and Z in the following reactions: X overset(Delta)to Y+CO_(2) uarr Y+Z to Ca_(3)(PO_(4))_(2)

Answer»

<P>`X=CaCO_(3), Y=CaO, Z=P_(4)O_(6)`
`X=Ca(OH)_(2), Y=CaO, Z=P_(4)O_(6)`
`X=CaCO_(3), Y=Ca(OH)_(2), Z=P_(4)O_(10)`
`X=CaCO_(3), Y=CaO, Z=P_(4)O_(10)`

Solution :`underset((X))(CaCO_(3(s))) underset(1070-1270K)overset(Delta)to underset((Y))(CaO_((s)))+CO_(2)`
`underset("oxide")underset("Calcium")underset((Y))(6CaO_((s)))+underset("pentoxide")underset("Phosphorous")underset((Z))(P_(4)O_(10(s))) overset(Delta)to underset("PHOSPHATE")underset("Calcium")(2Ca_(3)(PO_(4))_(2(s)))`
Discussion
25.

[{:(CH(OH)COOH),(|),(CH(OH)COOH):}] on reduction with HI consumed four moles of HI. The reduction product formed is

Answer»

`CH_(3)CH_(2)CH_(2)CH_(3)`
2-Butanol
Succine ACID
Tartonic acid

Solution :`{:(CH(OH) COOH ""CH_(2)COOH),(""+ 4HI rarr "|" ""+ 2H_(2)O + 2I_(2)),(CH(OH)COOH "" CH_(2)COOH),("Succinic acid"):}`
Discussion
26.

(A) & (B)are isomers ,Isomer (B) is :

Answer»




SOLUTION :
Discussion
27.

CHO - CHO overset(-OH)rarr?

Answer»

`CH_(3)OH + CH_(3)OH`
`H_(2)COH - COO^(-)`
`H_(3)COH + HCOOH`
`overset(-)(O) OC - CO overset(-)(O)`

Solution :`{:(CHO""COO^(-)),("|""|"),(CHO overset(OH^(-))rarr CH_(2)OH):}`
This is CALLED as Internal Cannizzaro's Reaction
Discussion
28.

Chloropicrin is used as ………………… .

Answer»

SOLUTION :SOIL STERILIZING AGENT
Discussion
29.

Chloropicrin is prepared by adding nitric acid to_____

Answer»

`C Cl_(4)`
`CH_(3)Cl`
`CHCl_(3)`
none of these

Solution :`CHCl_(3)`
Discussion
30.

Chlorophyll, the green colouring matter of plants contains 2.68% of magnesium by mass. Calculate the number of magnesium atoms present in 2.5 g of chlorophyll.

Answer»


ANSWER :`1.6 XX 10^(21)`
Discussion
31.

Chlorophyll present in green leaves of plants absorbs light at 4.620 xx 10^(14) Hz. Calculate the wavelength of radiation in nanometer. Which part of the electromagnetic spectrum does it belong to ?

Answer»

Solution :`lambda=(c )/(V)=(3.0 xx10^(8)) (ms^(-1))/(4.620 xx10^(14) HZ)`
`0.6494 xx10^(-4) m`
=649.4 nm visiblelight
Discussion
32.

Chlorophyll present in green leaves of plants absorbs light at 4.620 xx 10^(4)Hz. Calculate the wavelength of radiation in nanometer. Which part of the electromagnetic spectrum does it belong to ?

Answer»

SOLUTION :`lamda = (c)/(v) = (3.0 XX 10^(8) ms^(-1))/(4.620 xx 10^(14) s^(-1)) = 0.6494 xx 10^(-6) m = 649.4 xx 10^(-9) m = 649.4 NM` Thus, it lies in the visible light
Discussion
33.

Chlorophyll is a compound of calcium.

Answer»


SOLUTION :CHLOROPHYLL CONTAINS MAGNESIUM.
Discussion
34.

Chlorophyll contains

Answer»

`Ca^(2+)`
`Mg^(2+)`
`Fe^(2+)`
`Fe^(3+)`

ANSWER :B
Discussion
35.

Chlorophy in greenplantabsorbthe light4.620 xx 10^(14) Hzthen findthe lengthof thedline andalsostatethe regionin spectra.

Answer»

SOLUTION :`649.4 nmvisiblespectrum
Discussion
36.

Chloroform reacts with nitric acid to produce

Answer»

NITRO toluene
nitro glycerine
CHLOROPICRIN
chloropicric acid

Solution :chloropicrin
Discussion
37.

Chloroform reacts with nitric acid to produce …………………… .

Answer»

nitro-toluene
nitro-glycerine
CHLOROPICRIN
chloropicric ACID

SOLUTION :chloropicrin
Discussion
38.

Chloroform is passed from methane according to the reaction : CH_(4)(g) + 3Cl_(2)(g) rarr CHCl_(3)(l) + 3HCl(g) Calculate Delta Hfor the reaction given that enthalpies of formation of HCl(g), CH_(4)(g)and CHCl_(3)(g) are - 92.0 ,-74.9 and -134.3kJ per mole respectively.

Answer»


Solution :`Delta_(r) H^(@) = [ Delta_(r) H^(@)(CHCl_(3)) + 3Delta_(f)H^(@) (HCl) ]- [ Delta_(f)H^(@)(CH_(4)) + 3Delta_(f) H^(@) (Cl_(2))]`
`[ ( - 134.3) + 3 (-92.0 ) ]-[( - 74.9 ) + 0]`
` = - 335.4kJ MOL^(-1)`
Discussion
39.

Chloroform is kept with a little ethyl alcohol in a dark coloured bottle. Why?

Answer»

Solution :(i) Chloroform is slowly oxidised by air in the presence of light to an extremely poisonous gas, carboxyl chloride (phosgene), it is therefore stored in closed dark COLOURED bottles completely filled so that air is kept out.
(II) With the use of 1% ethanol we can stabilise chloroform, because ethanol can convert the poisonous `COCl_2`gas into non poisonous diethyl CARBONATE.
`COCl_2 + 2C_2 H_5OH to CO(OC_2H_5)_2 + 2HCl`
Discussion
40.

Chloroform is kept with a little ethyle alcohol in dark coloured bottle, why?

Answer»

Solution :(i) Chloroform is slowly oxidised by air in the presence of light to an EXTREMELY posionous gas, carboxyl chloride (phosgene), it is THEREFORE stored in closed dark coloured bottles completely filled so that air is kept out.
(ii) With the USE of 1% ethanol we can stabilise chloroform, ethanol can covert the poisonous `COCl_(2)` gas into non poisonous diethyl carbonate.
`COCl_(2) + 2C_(2)H_(5)OH rarr CO(OC_(2) H_(5))_(2) + 2HCl`
Discussion
41.

Chloroform is kept with a little ethyl alcohol in a dark coloured bottle why?

Answer»

SOLUTION :Chloroform undergoes oxidation in the presence of LIGHT and AIR to form phosgene (carbonyl chloride).
`UNDERSET("Chloroform")(CHCl_(3))+(1)/(2) O_(2) underset("light")overset("air")to underset("Phosgene")(COCl_(2))+HCl`
Since phosgene is very poisonous, its presence makes chloroform unfit for use as anaesthetic.
Discussion
42.

Chloroform is converted to methylene-chloride by the action of ……………… .

Answer»

SOLUTION :`ZN + HCL and H_2//Ni`
Discussion
43.

Chlorofluorocarbon releases which of the following chemical harmful to ozone ?

Answer»

Fluorine
Chlorine
NITROGEN dioxide
Sulphur dioxide

Answer :B
Discussion
44.

Chloroethane is treated with alcoholic potassium hydroxide. The product formed is

Answer»

`C_(2)H_(6)O`
`C_(2)H_(6)`
`C_(2)H_(4)`
`C_(2)H_(4)O`

Answer :C
Discussion
45.

Chlorobenzene when heated with aqueous ammonia in the presence of Cu_(2)O under pressure gives :

Answer»

Aniline
Diphenyl
Diphenylamine
Phenyl isocyanide

Solution :
Discussion
46.

Chlorobenzene reactws with CuCN at 523 K in the presence of ____

Answer»

NaOH
pyrrole
PYRIDINE
Na

Solution :Pyridine
Discussion
47.

Chlorobenzene reacts with trichloroacetaldehyde in the presence of H_2SO_4 The major product formed is :

Answer»




ANSWER :C
Discussion
48.

Chlorobenzene on treatment with sodium in dry ether gives diphenyl. The name of the reaction is

Answer»

FITTIG reaction
Wurtz-Fitting reaction
Sandmeyer reaction
Gatterman reaction

Answer :A
Discussion
49.

Chlorobenzene is o,p-directing in electrophilic substitution reaction. The directing influence is explained by :

Answer»

`+m` of PH
`+I`of CL
`+m` of Cl
`+I` of Ph

Answer :C
Discussion
50.

Chlorobenzene is commercially prepared by :

Answer»

Etard reaction
Wurtz FITTIG reaction
Raschig reaction
Grignard reaction.

Answer :C
Discussion