The electrolytic refining process is used to purify which of the following metals?

$\text{ ' }{\mathrm{Cu}}^{\text{'}}\mathrm{and}\text{ 'Zn' a }$ are usually purified by electrolytic refining. Here the electrolyte of refining metal is used.$\text{ ' }{\mathrm{Cu}}^{\text{'}}$ and $\text{ 'Zn' a }$ available as ${\mathrm{CuSO}}_4$ & ${\mathrm{ZnSO}}_4$used as electrolytes. So, they are purified using this process.