Engineering Entrance Sample Papers

Electrochemistry Multiple Choice Questions Answers

electrochemistry problems worksheet

Electrochemistry Practice Test with Answers

Question 1
In Cu – Zn cell
A
Chemical energy is converted to light energy
B
Oxidation occurs at the copper cathode
C
Reduction occurs at the copper cathode
D
Reduction occurs at the anode
Question 2
When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are Cathode - Anode
A
Pure zinc - Pure copper
B
Impure sample - Pure copper
C
Pure copper - Impure sample
D
Impure zinc - Impure sample
Question 3
The conductivity of strong electrolyte is
A
Depend upon density of electrolytes itself
B
Increase on dilution slightly
C
Does not change with dilution
D
Decrease on dilution
Question 4
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
65.97 gm
B
55.97 gm
C
85.97 gm
D
75.97 gm
Question 5
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
–1.10 V
B
–0.110 V
C
0.110 V
D
1.10 V
Question 6
The amount of silver deposited by passing 241.25 coulomb of current through silver nitrate solution is
A
2.7 mg
B
2.7 g
C
0.27 g
D
0.54 g
Question 7
Beryllium is placed above magnesium in the second group. Beryllium dust, therefore when added to MgCl2 solution will
A
Have no effect
B
Precipitate MgO
C
Precipitate Mg metal
D
Lead to dissolution of Be metal
Question 8
The amount of ion discharged during electrolysis is not directly proportional to
A
Resistance
B
Current
C
Chemical equivalent of the ion
D
Time
Question 9
The number of coulombs required for the deposition of 107.870 g of silver is
A
10,000
B
1,93,000
C
96,500
D
48,250
Question 10
Which of the following liberate hydrogen on reaction with dilute H2SO4
A
Cu
B
Hg
C
Fe
D
Al
Question 11
In the electrolytic cell, flow of electrons is from
A
Cathode to anode through internal supply
B
Cathode to anode through external supply
C
Anode to cathode through internal supply
D
Cathode to anode in solution
Question 12
On passing 0.5 faraday of electricity through NaCl, the amount of Cl deposited on cathode is

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A
17.75 gm
B
142 gm
C
71 gm
D
35.5 gm
Question 13
Which solution will show highest resistance during the passage of current?
A
0.1 N NaCl
B
1 N NaCl
C
2 N NaCl
D
0.05 N NaCl
Question 14
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
Electro chemical equivalent of electrolysis
D
Mass of electrons
Question 15
Normal aluminium electrode coupled with normal hydrogen electrode gives an emf of 1.66 volts. So the standard electrode potential of aluminium is
A
+ 1.66 V
B
+ 0.83 V
C
– 0.83 V
D
– 1.66 V
Question 16
How many Faradays are required to generate one gram atom of magnesium from MgCl2
A
4
B
2
C
3
D
1
Question 17
Which of the following will not conduct electricity in aqueous solution?
A
Sugar
B
Copper sulphate
C
Common salt
D
None of these
Question 18
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
–0.34 + 0.76 = +0.42 V
B
–0.76 – (+0.34) = –1.10 V
C
–0.76 + (–0.34) = 0.42 V
D
0.34 – (0.76) = 1.10 V
Question 19
Which of the following shows electrical conduction?

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A
Graphite
B
Potassium
C
Sodium
D
Diamond
Question 20
Amount of electricity that can deposit 108 gm of silver from AgNO3 solution is
A
None of these
B
1 faraday
C
1 coulomb
D
1 ampere
There are 20 questions to complete.

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