Electrolysis - Jamb Chemistry Past Questions and Answers

Question 1:

• JAMB 2019

During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,

A. The litmus turns blue but no gas is evolved
B. The litmus turns blue and oxygen is evolved
C. The litmus turns blue and hydrogen is evolved
D. The litmus turns red and oxygen is evolved
E. The litmus turns red and then becomes colourless

Question 2:

• JAMB 2019

The cost of discharging 6.0g of a divalent metal, X from its salt is What is the cost of discharging 9.0g of a trivalent metal, Y from its salt under the same condition?
[X = 63, Y = 27, 1F = 96,500C]

A. N12.00
B. N27.00
C. N63.00
D. N95.00

Question 3:

• JAMB 1978

During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,

A. The litmus turns blue but no gas is evolved
B. The litmus turns blue and oxygen is evolved
C. The litmus turns blue and hydrogen is evolved
D. The litmus turns red and oxygen is evolved
E. The litmus turns red and then becomes colourless

Question 4:

• JAMB 1979

In the electrolysis of dilute sulphuric acid using platinum electrodes, the products obtained at the anode and cathode are:
Anode Cathode

A. Sulphur hydrogen
B. Hydrogen oxygen
C. Oxygen Hydrogen
D. Hydrogen sulphate ions
E. Sulphur oxygen

Question 5:

• JAMB 1979

0.1 Faraday of electricity was passed through a solution of copper (ll) sulphate. The maximum weight of copper deposited on the cathode would be [Cu = 64]

A. 64.0g
B. 32.0g
C. 16.0g
D. 6.4 g
E. 3.2g