Physics 2011 JAMB Past Questions - Question 40: Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis ?

Correct Answer

A

Explanation

When a metal Y is used to electroplate another metal X in electrolysis, the following processes will occur:

1. Oxidation at the anode: Metal Y will undergo oxidation at the anode, losing electrons and forming metal cations Y+.

2. Reduction at the cathode: Metal X cations (X+) from the electrolyte will be reduced at the cathode, gaining electrons and depositing metal X onto the surface.

3. Ion migration: Metal cations Y+ from the anode will migrate through the electrolyte towards the cathode.

4. Electrolyte replenishment: To maintain charge neutrality, anions from the electrolyte will migrate towards the anode to balance the positive charge of the metal cations Y+.

Overall, metal Y will act as the sacrificial anode, providing metal cations Y+ for the electroplating process, while metal X will be deposited onto the cathode surface.