Electrochemistry MCQ | Questions – Paper 7


Topic: Electrochemistry, Test No.: 07, Total MCQs: 10

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Question 1
The process of zinc-plating on iron sheet is known as
A
galvanization
B
roasting
C
annealing
D
smelting
Question 2
The logarithm of the equilibrium constant of the cell reaction corresponding to the cell X(s) | X2+(aq) || Y+(aq) | Y(s) with standard cell potential, EoCell = 1.2 V is given by
A
12.5
B
21.5
C
40.5
D
47.5
Question 3
The oxidation state of chromium in the final product formed by the reaction between Kl and acidified potassium dichromate solution is
A
+6
B
+4
C
+3
D
+2
Question 4
The pH of aqueous KCl solution is 7.0. This solution was electrolyzed for a few seconds using Pt electrodes. Which of the following is correct?
A
The pH of solution decreases
B
The pH of solution increases
C
Cl2 is liberated at cathode
D
The pH of solution remains the same
Question 5
The reduction potential values of X, Y and Z are -3.05 V, -0.44 V and -0.83 V respectively. Which of the following order is correct with respect to their reducing property?
A
X > Y > Z
B
X > Z > Y
C
Y > Z > X
D
Z > Y > X
Question 6
The specific conductance of 0.1 M NaCl solution is 1.06 ´ 10-2 ohm-1 cm-1. Its molar conductance in ohm-1 cm2 mol-1 is
A
1.06 ´ 102
B
1.06 ´ 103
C
1.06 ´ 104
D
53 ´ 102
Question 7
The standard EMF of Daniell cell is 1.10 volt. The maximum electrical work obtained from the Daniell cell is
A
212.3 kJ
B
175.4 kJ
C
106.15 kJ
D
53.07 kJ
Question 8

The standard potentials at 25°C for the half reactions are given against them below

Zn2+ + 2e Zn E° = −0.762V

Mg2+ + 2e Mg E° = −2.37V

Zinc duct is added to Mgcl2 solution

A
Magnesium is precipitated
B
Zinc dissolves in the solution
C
Zinc chloride in formed
D
No reaction takes place
Question 9
The standard reduction potential for Cu2+/Cu; Zn2+/Zn; Li+/Li; Ag+/Ag and H+/H2 are 0.34 V, -0.762 V, -3.05 V, + 0.80 V and 0.00 V respectively. Choose the strongest reducing agent among the following.
A
Zn
B
H2
C
Ag
D
Li
Question 10
The standard reduction potentials of Ag, Cu, Co and Zn 0.799, 0.337, –0.277 and –0.762V respectively. Which of the following cells will have maximum cell e.m.f.?
A
Zn | Zn+2 (1M) ||Cu2+ (1M) |Cu
B
Zn | Zn2+ (1M) || Ag+ (1M) | Ag
C
Cu | Cu2+ (1M) || Ag+ (1M) | Ag
D
Zn | Zn2+ (1M) || Co2+ (1M) Co
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