$(i)$ Given below are the steps for the extraction of copper from its ore. Write the reactions involved:
$(a)$ Roasting of copper $(I)$ sulphide
$(b)$ Reduction of copper $(I)$ oxide with copper $(I)$ sulphide
$(c)$ Electrolytic refining
$(ii)$ Draw a neat and well-labelled diagram for the electrolytic refining of copper.

(N/A) $(i)$ $(a)$ Roasting of sulphide ore:
$2Cu_2S(s) + 3O_2(g) \xrightarrow{\Delta} 2Cu_2O(s) + 2SO_2(g)$
$(b)$ Reduction of copper $(I)$ oxide:
$2Cu_2O(s) + Cu_2S(s) \xrightarrow{\Delta} 6Cu(s) + SO_2(g)$
This reaction is known as auto-reduction.
$(c)$ Reaction for electrolytic refining:
At cathode: $Cu^{2+}(aq) + 2e^- \rightarrow Cu(s)$
At anode: $Cu(s) \rightarrow Cu^{2+}(aq) + 2e^-$
$(ii)$ The diagram for the electrolytic refining of copper shows an electrolytic tank containing acidified copper sulphate solution,an impure copper anode,a pure copper cathode,and the collection of anode mud at the bottom.