JAMB - Chemistry (1995 - No. 18)
In the process of silver-plating a metal M, the metal M is the?
anode and a direct current is used
cathode and an alternating current is used
anode and an alternating current is used
cathode and a direct current is used
Εξήγηση
Plating requires ions to flow through an electrolyte in an electric field. Positive ions flow with the electric field, negative ions against the electric field. This electric field comes from a DC supply connected to the electrodes. While silver plating, Ag is the anode while the metal to be coated is the cathode.