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Year: 2025
Topic: Electrochemistry
1.
If the molar conductivity (\(\Lambda_m\)) of a 0.050 mol L-1 solution of a monobasic weak acid is 90 S cm2 mol-1, its extent (degree) of dissociation will be
[Assume \(\Lambda_+^\circ\, =\, 349.6 \,S\, cm^2\, mol^{-1}\) and \(\Lambda_-^2\, =\, 50.4\, S\, cm^2\, mol^{-1}\)]
(1).
0.215
(2).
0.115
(3).
0.125
(4).
0.225

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Year: 2024
Topic: Electrochemistry
2.
Mass in grams of copper deposited by passing 9.6487 A current through a voltmeter containing copper sulphate solution for 100 seconds is:
(Given: Molar mass of \(\text{Cu:}\, 63\,g\,\text{mol}^{-1}\), \(1\text{F}\, =\, 96487 \text{C}\))
(1).
31.5 g
(2).
0.0315 g
(3).
3.15 g
(4).
0.315 g

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Year: 2024
Topic: Electrochemistry
3.
Match List-I with List-II:

Choose the correct answer from the options given below:
(1).
A-II, B-III, C-I, D-IV
(2).
A-III, B-IV, C-II, D-I
(3).
A-II, B-IV, C-I, D-III
(4).
A-III, B-IV, C-I, D-II

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Year: 2023
Topic: Electrochemistry
4.
The conductivity of centimolar solution of KCl at \(25^\circ C\) is 0.0210 ohm-1 and cm-1 and the resistance of the cell containing the solution at \(25^\circ C\) is 60 ohm. The value of cell constant is-
(1).
3.28 cm-1
(2).
1.26 cm-1
(3).
3.34 cm-1
(4).
1.35 cm-1

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Year: 2022
Topic: Electrochemistry
5.
Given below are half cell reactions:

Will the permanganate ion, MnO4- liberate O2 from water in the presence of an acid?
(1).
\(\text{Yes, because}\, E^\circ _{cell}\,=\,+0.287\, \text{V}\)
(2).
\(\text{No, because}\, E^\circ _{cell}\,=\,-0.287\, \text{V}\)
(3).
\(\text{Yes, because} \,E^\circ _{cell}\,=\,+2.733\, \text{V}\)
(4).
\(\text{Np, because}\, E^\circ _{cell}\,=\,-2.733\, \text{V}\)

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Year: 2022
Topic: Electrochemistry
6.
At 298 K, the standard electrode potentials of
\(\displaystyle \frac{Cu^{2+}}{Cu}\), \(\displaystyle \frac{Zn^{2+}}{Zn}\), \(\displaystyle \frac{Fe^{2+}}{Fe}\), and \(\displaystyle \frac{Ag^{+}}{Ag}\) are \(0.34\, \text{V}\), \(-0.76\, \text{V}\), \(-0.44\, \text{ V}\) and \(0.80\, \text{V}\), respectively.
On the basis of standard electrode potential, predict which of the following reaction cannot occur?
(1).
(2).
(3).
(4).

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Year: 2022
Topic: Electrochemistry
7.
Find the emf of the cell in which the followingreaction takes place at 298 K
(1).
1.0385 V
(2).
1.385 V
(3).
0.9615 V
(4).
1.05 V

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Year: 2021
Topic: Electrochemistry
8.
The molar conductance of NaCl, HCI and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol-1 respectively. The molar conductance of CH3COOH at infinite dilution is.
Choose the right option for your answer.
(1).
201.28 S cm2 mol-1
(2).
390.71 S cm2 mol-1
(3).
698.28 S cm2 mol-1
(4).
540.48 S cm2 mol-1

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Year: 2021
Topic: Electrochemistry
9.
The molar conductivity of 0.007 M acetic acid is 20 S cm2 mol-1, What is the dissociation constant of acetic acid ? Choose the correct option.
(1).
1.75 x 10-4 mol L-1
(2).
2.50 x 10-4 mol L-1
(3).
1.75 x 10-5 mol L-1
(4).
2.50 x 10-5 mol L-1

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Year: 2020
Topic: Electrochemistry
10.
On electrolysis of dilute suiphuric acid using Platinum (Pt) electrode, the product obtained at anode will be:
(1).
Oxygen gas
(2).
H2S gas
(3).
SO2 gas
(4).
Hydrogen gas

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Solution
Year: 2020
Topic: Electrochemistry
11.
The number of Faradays(F) required to produce 20 g of calcium from molten CaCl2 (Atomic mass of Ca = 40 g mol-1) is:
(1).
2
(2).
3
(3).
4
(4).
1

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Year: 2019
Topic: Electrochemistry
12.
For a cell involving one electron \(\text{E}^\circ _\text{cell}\) = 0.59 V at 298 K, the equilibrium constant for the cell reaction is
[Given that \(\displaystyle \frac{2.303 RT}{F}\) = 0.059 V at T = 298 K]
(1).
1.0 x 105
(2).
1.0 x 1010
(3).
1.0 x 1030
(4).
1.0 x 102

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Solution
Year: 2019
Topic: Electrochemistry
13.
For the cell reaction
2Fe3+(aq) + 2I–(aq) \(\rightarrow\) 2Fe2+(aq) + I2 (aq)
\(\text{E} ^\oplus_\text{cell}\) = 0.24 V at 298 K. The standard Gibbs energy cell (\(\Delta_r \text{G}^\ominus\)) of the cell reaction is
[Given that Faraday constant F = 96500 C mol–1]
(1).
– 23.16 kJ mol–1
(2).
46.32 kJ mol–1
(3).
23.16 kJ mol–1
(4).
– 46.32 kJ mol–1

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Solution
Year: 2017
Topic: Electrochemistry
14.
Extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by
(1).
Displacement with Zn
(2).
Liquation
(3).
Distillation
(4).
Zone refining

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Solution
Year: 2017
Topic: Electrochemistry
15.
Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field ?
(1).
Li
(2).
Na
(3).
K
(4).
Rb

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Solution
Year: 2017
Topic: Electrochemistry
16.
In the electrochemical cell
Zn|ZnSO4 (0.01M)| |CuSO4(1.0 M)|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that of CuSO4 changed to 0.01 M, the emf changes to E2. From the following, which one is relationship between E1 and E2
(Given, \(\frac{\text{RT}}{\text{F}}\) = 0.059)
(1).
E2 = 0 \(\neq\) E1
(2).
E1 = E2
(3).
E1 < E2
(4).
E1 > E2

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Solution
Year: 2016
Topic: Electrochemistry
17.
The pressure ofH2 required to make the potential of H<2/sub> - electrode zero in pure water at 298 K is
(1).
10-12 atm
(2).
10-10 atm
(3).
10-4 atm
(4).
10-14 atm

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