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.

During electrolysis of H_(2)O , the molar ratio of H_(2) and O_(2) formed is

Answer»

` 2 : 1`
`1 : 2`
`1 : 3`
`1 : 1`

SOLUTION :`H_(2)O to H_(2) + 1//2 O_(2)`
`THEREFORE` The ratio of `H_(2)` to `O_(2)`
`1 : 0.5therefore 2 : 1`
Discussion
2.

Draw the diagram showing micelle formation by the following detergent. CH_(3)(CH_(2))_(10)CH_(2)Osbar(O_(3))Na

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Solution :Sodium lauryl sulphate `CH_(2)(CH_(2))_(10)CH_(2)OSO_(3)^(-)overset(+)(N)a` is an example of anionic detergent.
when added to water, it DISSOCIATES as follows
`CH_(3)-(CH_(2))_(10)-CH_(2)OSO_(3)^(-)overset(+)(N)aoverset(+H_(2)O)rarrCH_(3)-(CH_(2))_(10)CH_(2)-OSO_(3)^(-)+overset(+)(N)a`
These anions are PRESENT on the surface with their `-OSO_(3)^(-)` groups in water and hydrocarbon part staying away from it and remain at the surface.
At higher concentration, these anions are pulled into the bulk of the solution and form an aggregate of spherical SHAPE with their hydrocabonpart pointing towards the centre and `OSO_(3)^(-)` part outwards on the surface of the SPHERE.
An aggregatethus formed is KNOWN as micelle.
Discussion
3.

During electrolysis of fused NaOH

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`H_2` is LIBERATED at CATHODE
`O_2` is liberated at cathode
`H_2` is liberated at ANODE
`O_2` is liberated at anode

Answer :D
Discussion
4.

Draw the diagram showing micelle formation by the following detergent. CH_3(CH_2)_10CH_2OSO_3^(-)overset+Na

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SOLUTION :
Discussion
5.

During electrolysis of fused CaH_2,H_2 is liberated at :

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Anode
Cathode
Either electrode
Not at all

Answer :A
Discussion
6.

During electrolysis of fused aluminium chloride 0.9gm of aluminium was deposited on the cathode. Thevolume of chlorine liberated at the anode will be

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2.24 litres
11.2 litres
1.12 litres
5.6 litres

Answer :A
Discussion
7.

During electrolysis of dilute aqueous CuSO_(4) solution by inert electrode, the pH of solution is. . .

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Decreases
Increases
Remains constant
Decreases after increases.

Solution :During electrolysis of copper sulphate solution by INERT electrode `H_(2)SO_(4)` is obtained. So pH of solution is DECREASED.
Discussion
8.

During electrolysis of aqueous solution of Na_2SO_4 using graphite electrode .........

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CONCENTRATION of `Na_2SO_4` DECREASES. 
Concentration of `Na_2SO_4` remains CONSTANT. 
Concentration of `Na_2SO_4` INCREASES. 
Concentration of `Na_2SO_4` FIRST increases and then decreases. 

Answer :C
Discussion
9.

During electrolysis of aqueous NaOH,4gof O_2 gas is liberated at NTP at anode, H_2 gas liberated cathode is

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2.8 LITRES
5.6 litres
11.2 litres
22.4 litres

ANSWER :B
Discussion
10.

During electrolysis of aqueous solution of a salt pH in the space near one of the electrodes is increased. Which of the following salt solution was electrolysed?

Answer»

KCL
`CuCl_(2)`
`Cu(NO_(3))_(2)`
`CuSO_(4)`

Answer :A
Discussion
11.

During electrolysis of an aqueous solution of sodium sulphate, 2.4 L of oxygen at STP was liberated at anode. The volume of hydrogen at STP, liberated at cathode would be

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1.2 L
2.4 L
2.6 L
4.8 L

ANSWER :D
Discussion
12.

Draw the cis, trans isomers for the following and designate them as E or Z.

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`HOH_(2)C-CH=CHCH_(2)CH_(3)`
`CH_(3)CH=CHCO_(2)H`
`CH_(3)CH=CH-CHO`
`CHCl=CHBr`

Answer :D
Discussion
13.

During electrolysis of a solution of AgNO_(3) , 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be

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1.08g
10.8g
21.6g
108g

Answer :B
Discussion
14.

Draw the bond line structures of the following compounds whose IUPAC names are given as under: (a) 4-Methylpent-1-ene (b) Hex-1-yne (c) 2,3-Dimethylbut-2-ene (d) 3-Isbutylhept-1-ene (e) 3-Ethyl-5-Methylhex-1-ene (f) Penta-1,4-diyne (g) Pent-1-en-4-yne (h)trans-1,3-Dichlorocyclopentane (i) 3,4-Dipropylhepta-1,3,5-triene (j) 4,4-Dimethylpentanal (k) Ethyl-2-cyanopropanoate (l) N-Methylpropan-1-amine. (m) N-Ethyl-N-methyl-2-aminopropane (n) Pentanalimine (o) N-N-Dimethylbutanamide (p) 4-Phenylbutanal (q) 3-Ethenylpenta-1,3-diene (r) 4-Hydroxy-4-methyl-2-pentanone (s) 2,6 -Dimethylhepta-2,5-dienoic acid (t) 1-Cyclopropyl-3-methylpent-1-ene (u) 2,2,6,6-Tetramethyloctane (v) 3-Cyclobutyblut-1-ene (w) 5,6-Dimethylcyclohex-2-en-1-one (x) 3-Ethyl-4-methylhex-4-en-2-one (y) 3- phenylprop-2-en-1-oic-acid (z) 1,1,1,-Trichloro-2,2-diphenylethane.

Answer»


ANSWER :`(##GRB_ORG_CHM_P1_C03_E02_016_A01##)`
Discussion
15.

During electrolysis of an aqueous solution of Cu^(2+) sulphate , 0.635 g of copper was deposited at cathode. The amount electricity consumed in coulomb is :

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1930
3860
96500
4825

Answer :A
Discussion
16.

Draw tge structuresof (i) D - Gluceose (ii) D - fructose .

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SOLUTION :
Discussion
17.

During electrolysis of a NaCI a part of the reaction is Na^+ +e^- rarrNa This cannot be termed as :

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Oxidation
Reduction
Deposition
Cathode reaction

Answer :A
Discussion
18.

During electrolysis of 1 litre of aq. CuSO_4 , the P^(H) of the solution is changed from 5.0 to 4.3 . Then the number of faradays consumed in the process is (x xx 10^(-4)) , here , (x + y) = ?

Answer»


Solution :`(H_2O + CuSO_4) overset("electrolysis/2F")to CU+ (1)/(2)O_2 UARR + (2H^(oplus)+ SO_4^(-2))`
` 2F overset("PASSED ") to 2` moles of `H^(oplus)`
`Q to n xx 4 xx 10^(-5) , n = (Q xx 2)/(2F) = 4 xx 10^(-5) , Q = 4 xx 10^(-5) xxF`
` Q = x xx 10^(-4) xx F , (x + y) = (4+5) = 9`
Discussion
19.

Draw structures of the following derivatives. (i) The ethylene ketal of hexan-3-one (ii) The methyl hemiacetal of formaldehyde

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SOLUTION :
Discussion
20.

During electro-osmosis of Fe(OH)_(3) sol :

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sol particles MOVE towards anode
sol particles move towards cathode
the dispersion medium moves towards anode
the dispersion medium moves towards cathode

Solution :In electro-osmosis, the sol particles are prevented from migration WHEREAS the dispersion medium migrates in the direction OPPOSITE to those of particles.
Here, the medium is NEGATIVELY CHARGED.
Discussion
21.

During electrolysis of a concentrated aqueous solution of NaCl , what is the product at anode ?

Answer»

`Na`
`Cl_(2)`
`O_(2)`
`H_(2)`.

Solution :`Cl_(2)`is produced as `Cl^(-)` IONS need voltage for OXIDATION to `Cl_(2)` than needed by `H_(2)O` for oxidation to `O_(2)` (This EXTRA voltage needed by `H_(2)O` is CALLED overvoltage) .
Discussion
22.

Draw structures of the following derivatives: (i) The 2,4-dinitrophenylhydrazone of benzaldehye. (ii) Cyclopropanone oxime. (iii) Acetaldehydedimethyl acetal, (vI0 The methyl hemiacetal of formaldehyde. (v) The ethylene ketal of hexan-3-one.

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SOLUTION :.
Discussion
23.

During electrolysis, 2A current is passed through an electrolytic solution for 965 S. The number of moles of electrons passed will be

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0.02
0.01
200
0.037

Answer :A::B
Discussion
24.

Draw structures of the following derivatives: (i) The 2,4-dinitrophenylhydrazone of benzaldehyde

Answer»

SOLUTION :STRUCTURES of COMPOUNDS (i) to (VI) are GIVEN below: 
Discussion
25.

During discharging of lead-storage acid battery following reaction takes place : Pb(s) +PbO_(2)(s)+2H_(2)SO_(4)rarr 2PbSO_(4)(s)+2H_(2)O If 2.5 amp of current is drawn for 965 minutes, H_(2)SO_(4) consumed is :

Answer»

`0.75 ` MOL
`3.00 ` mol
`1.50` mol
`4.50` mol

ANSWER :C
Discussion
26.

During dischare of a lead storage battery the denisty of suphuric acid fell form 1.3 to 1.15 gm/ml sulphuric acid of denisity 1.3 gm/ml is 40 % H_(2)SO_(4) by wt and that of denisty 1.15 gm/ml is 20% by wt the battery hold amp hours for which the battery must have been used Pb+SO_(4)^(-2)rarrPbSO_(4)+2e^(-)(discharging) PbO_(2)+4H^(+)+SO_(4)^(2-)+2erarrPnSO_(4)+2H_(2)O (discharging)

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265.04 AH
317.3 AH
289.56 AH
385.12 AH

Solution :317.3 AH
Discussion
27.

Draw structures of geometrical isomers of [Fe(NH_(3))_(2)(CN)_(4)]^(-).

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SOLUTION :
Discussion
28.

During distillation of coal tar. Anthrace ins mainly present

Answer»

LIGHT oil
Heavy oil
Middle oil
Green oil

Solution :FACTUAL QUESTIONS.
Discussion
29.

During discharging of Lead storage cell, the reaction taking place at cathode is represented by :

Answer»

`PB to Pb^(+2)+2e^(-)`
`Pb+SO_(4)^(-2) to PbSO_(4)+2e^(-)`
`PbO_(2)+4H^(+)+SO_(4)^(--)+2e^(-) to PbSO_(4)+2H_(2)O`
`Pb+PbO_(2)+2H^(+)+2SO_(4)^(--)+2e^(-) to 2PbSO_(4)+H_(2)O`

SOLUTION :Discharging REACTION.
Discussion
30.

During discharging of lead storage battery, which of the following is/are true?

Answer»

`GH_2SO_4` is PRODUCED
`H_2O` is CONSUMED
`PbSO_4` is FORMED both electrods
Density of electolytic SOLUTION decreases

Answer :C::D
Discussion
31.

Draw structures of each of the following compounds : (ii) (S)-2-bromohexane.

Answer»

SOLUTION :
Discussion
32.

During discharge of Dry cell , the gas liberated at the cathode is :

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`H_(2)`
`O_(2)`
`Cl_(2)`
`N_(2)`

SOLUTION :In dry cell , reduction take place at C cathode as -
` 2NH_(4)^(+) + 2e^(-) to 2 NH_(3) + H_(2)`
Discussion
33.

During detection of P we get canary yellow ppt on addition of ammonium molybdate. The number of element in sp^(3) hybridisation from 15^(th) group is ______________.

Answer»


ANSWER :4
Discussion
34.

Draw structures of each of the following compounds : (i) (R)-2-butanol.

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SOLUTION :
Discussion
35.

During diazo coupling, the following group is retained

Answer»

`-N=N-`
`-N-=N-`
`NH_(2)`
NHR

Answer :A
Discussion
36.

During depression of freezing point in a solution , the following are in equilibrium

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Liquid SOLVENT, SOLID solute
Liquid solvent , solid solvent
Liquid solute , solid solute
Liquid solute, solid solvent

Answer :B
Discussion
37.

Draw structure Sulphury chloride (SO_(2)Cl_(2))

Answer»
Discussion
38.

During depression of freezing point in a solution the following are in equilibrium

Answer»

LIQUID SOLVENT, SOLID solvent
liquid solvent, solid SOLUTE
liquid solute, solid solute
liquid solute, solid solvent

Solution :Liquid solvent and solid solvent are in EQUILIBRIUM.
Discussion
39.

Draw structure Trithionate ion (S_(3)O_(6)^(2-))

Answer»
Discussion
40.

During the depression in freezing point experiment, an equilibrium is established between the molecules of

Answer»

LIQUID SOLVENT, SOLID solvent
Liquid solvent, Solid SOLUTE
Liquid solute, Solid Solute
Liquid solute, Solid solvent

Answer :A
Discussion
41.

During depression of freezing point in a solution, the following are in equilibrium:

Answer»

LIQUID SOLVENT and SOLID solvent
liquid solvent and solid SOLUTE
liquid solute and solid solute.
none is correct.

Solution :Conceptural QUESTION.
Discussion
42.

Draw structure Thionyl chloride (SOCl_(2))

Answer»
Discussion
43.

During dehydrohalogenation of 2-iodopropane which of the following carbocation is likely to be formed as an intermediate

Answer»

`CH_(3)CH_(2)CH_(2)^(+)`
`CH_(2)CH^(+)CH_(3)`
`CH_(3)CH_(2)^(+)`
`CH_(3)^(+)`

Solution :2-iodopropane is `CH_(3)CHlCH_(3)` is secondary alkyl HALIDE PRODUCED `CH_(3)CH^(+)CH_(3)` CARBOCATION on heterolysis.
Discussion
44.

During dehydrohalogenation of 2-bromobutane the major product is

Answer»

1-butane
2-butene
1-butanol
2-butanol

Solution :The major product 2-butane in which is FORMED accroding to Saytzeff RULE.
`CH_(3)CHBrCH_(2)CH_(3)+KOH OVERSET(alc) to H_(2)O+KBr+CH_(3)CH=CHCH_(3)`
Discussion
45.

Draw structure sodium dihydrogen pyrophosphate

Answer»
Discussion
46.

During dehydration of alcohols to alkenes by heating with conc. H_(2)SO_(4) the initiation step is

Answer»

Protonation of alcohol molecule
Formation of carbocation
Elimination of water
Formation of an ester

Solution :`H_(2)SO_(4)to H^(+)+ HSO_(4)^(-)`
`C_(2)H_(5)OH + H^(+) underset(" of alcohol")OVERSET("Protonation")to underset("Protonated alcohol")(C_(2)H_(5)-underset(H)underset(darr)overset(o+)O-H)`
Discussion
47.

During dehydration of alcohols to alkenes by heating with Conc. H_2SO_4, the initiation step is ……………. .

Answer»

PROTONATION of alcohol
formation of CARBOCATION
ELIMINATION of WATER
formation of carbonion

SOLUTION :protonation of alcohol
Discussion
48.

Draw structure Sodium hydrogen phosphate

Answer»
Discussion
49.

During the dehydration of alcohols to alkenes by heating with conc. H_(2)SO_(4), the initiating step is :

Answer»

PROTONATION of alcoholmolecule
FORMATION of carbocation
ELIMINATION of water
formation of an ester

ANSWER :A
Discussion
50.

Draw structure SiO_(2)

Answer»
Discussion