The metals produced by various reduction processes are not very pure. They contain impurities, which must be removed to obtain pure metals. The most…

(iii) (A)

Pure copper from the anode dissolves into electrolyte and an equivalent amount of pure metal from the electrolyte is deposited on cathode / \[\text { At anode : } \mathrm{Cu} \longrightarrow \mathrm{Cu}^{++}+2 \mathrm{e}^{-} \] \[\text { At cathode : } \mathrm{Cu}^{++}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Cu} \]

The soluble impurities go into the solution whereas insoluble impurities settle down at the bottom of the anode.

Reason - Zn is more reactive than copper

Reason - Silver is less reactive than Copper