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

Explanation

(i) `2Cu_(2)S(s) + 3O_(2)(g)overset("Heat")to2Cu_(2)O(s)+2SO_(2)(g)`
(ii) `2Cu_(2)O(s) +Cu_(2)S(s)overset("Heat")to 6Cu(s)+SO_(2)(g)`
(iii) Electrolytic refining
1. A thick block of the impure metal is made anode (+ ve).
2. A thin strip of pure metal is made cathode (- ve).
3. `CuSO_(4)` solution is taken as electrolyte.
At cathode`" "Cu^(2+)(aq)+2e^(-)toCu(s)`
At anode `" " Cu(s)toCu^(2+)(aq)+2e^(-)`
(b) The diagram showing electrolytic refining of copper.