Question

Identify the impure metal electrode in the given figure for electrolytic refining.

• A.
• B.
• C.

Answer 1

The correct option is B

In electrolytic refining:
$\bullet$ the impure metal is taken as anode (positive terminal)
$\bullet$ pure metal as cathode (negative terminal)
$\bullet$ a salt solution of the metal is taken as the electrolyte

When current is passed, the undissolved impurities get separated from the anode and settle down.
Only the metal present as dissolved form in the electrolyte gets deposited on the cathode.