In electrolytic refining, the impure metal is made as:
Electrolyte
Cathode
Anode
Both cathode and anode
In electrolytic refining the impure metal is made as anode and the pure metal is made as cathode.
In general, electrolytic refining is a process of purification of impure metal during which an electric current is passed through an electrolytic cell which contains impure metal as anode, a suitable electrolyte and pure metal as cathode.
In the electrolytic refining of Copper (electrolyte is CuSO4 solution + dil H2SO4 ;Pure Cu cathode and Impure Cu anode), metallic impurities having lower oxidation potential than Cu are deposited as __ sludge.