Electrolysis - Jamb Chemistry Past Questions and Answers

Question 41:

• JAMB 1994

Crude copper could be purified by the electrolysis of concentrated copper (II) chloride if the crude copper is?

A. Made both the anode and the cathode
B. Made the cathode
C. Made the anode
D. Dissolved in the solution

Question 42:

• JAMB 1994

In an electrolytic set-up to protect iron from corrosion, the iron is?

A. Made cathode
B. Made anode
C. Used with a metal of lower electropositive potential
D. Initially coated with tin

Question 43:

• JAMB 1995

In the oil drop experiment, Millikan determined the?

A. Charge to mass ratio of the electron
B. Mass of the electron
C. Charge of the electron
D. Mass of the proton

Question 44:

• JAMB 1995

In the process of silver-plating a metal M, the metal M is the?

A. Anode and a direct current is used
B. Cathode and an alternating current is used
C. Anode and an alternating current is used
D. Cathode and a direct current is used

Question 45:

• JAMB 1995

How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)?
(F = 96 500 C mol^-)

A. 0.5
B. 1.0
C. 1.5
D. 3.0