Metallurgy — Chemistry STD 10 — Question

C. Both (a) and (b)
Explanation: Coke is often sprinkled over the surface of electrolytes in certain electrolysis processes for multiple reasons, including:
(a) It reduces heat loss by acting as a thermal insulator, helping to maintain high temperatures required for some electrolysis processes.
(b) It prevents the burning of the anode by forming a protective layer around it, preventing it from reacting with the high-temperature environment inside the electrolytic cell.