Question

The electrolytic process by which an oxide of metal is coated over metal surface is called:

• A. electrolysis
• B. electroplating
• C. anodising
• D. electrorefining

Answer 1

Answer: (C)

anodising

Anodising is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. The process is called anodising because the part to be treated forms the anode electrode of an electrolytic cell.

Hence, the correct option is $\left(C\right)$