Which process is used to purify metals using electricity?
A
Roasting
B
Calcination
C
Electrorefining
D
Smelting
Correct Answer: Option C — Electrorefining
Explanation:
Electrorefining uses electrolysis to purify impure metals by dissolving the impure metal as the anode and depositing pure metal at the cathode, commonly used for purifying copper and other valuable metals.