Engineering Entrance Sample Papers

Electrochemistry Multiple Choice Questions Answers

electrochemistry problems worksheet
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Electrochemistry Practice Test with Answers

Question 1
A solution of a salt of a metal was electrolysed for 150 minutes with a current of 0.15 amperes. The weight of metal deposited was 0.783 gm. The equivalent weight of the metal is
A
75.97 gm
B
55.97 gm
C
65.97 gm
D
85.97 gm
Question 2
In the electrolytic cell, flow of electrons is from
A
Cathode to anode through internal supply
B
Cathode to anode in solution
C
Anode to cathode through internal supply
D
Cathode to anode through external supply
Question 3
The standard EMF for the given cell reaction Zn + Cu2+ = Cu + Zn2+ is 1.10 V at 25o C. The EMF for the cell reaction, when 0.1 M Cu2+ and 0.1 M Zn2+ solutions are used, at 25o C is

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A
0.110 V
B
–1.10 V
C
–0.110 V
D
1.10 V
Question 4
What is the standard cell potential for the cell

Zn / Zn2+ (1M) || Cu2+ (1M) / Cu

Eo for Zn / Zn2+ (1M) = –0.76 V & Cu2+ / Cu = + 0.34 V

A
–0.76 + (–0.34) = 0.42 V
B
–0.76 – (+0.34) = –1.10 V
C
–0.34 + 0.76 = +0.42 V
D
0.34 – (0.76) = 1.10 V
Question 5
Normal aluminium electrode coupled with normal hydrogen electrode gives an emf of 1.66 volts. So the standard electrode potential of aluminium is
A
+ 0.83 V
B
– 0.83 V
C
+ 1.66 V
D
– 1.66 V
Question 6
During the electrolysis of an electrolyte, the number of ions produced, is directly proportional to the

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A
Quantity of electricity passed
B
Time consumed
C
Mass of electrons
D
Electro chemical equivalent of electrolysis
Question 7
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are Cathode - Anode
A
Pure copper - Impure sample
B
Pure zinc - Pure copper
C
Impure sample - Pure copper
D
Impure zinc - Impure sample
There are 7 questions to complete.
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Vishal Arora

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