Given below are the steps for extraction of copper from its ore. Write the reaction involved.
(a) Roasting of copper (1) sulphide
Ans. 2Cu2S + 3O2 → 2Cu2O + 2SO2
(b) Reduction of copper (1) oxide with copper (1) sulphide.
2Cu2O + Cu2S → 6Cu + SO2
(c) Electrolytic refining
Ans. At cathode: Cu2+ + 2e- → Cu
(ii) Draw a neat and well labelled diagram for electrolytic refining of copper
Fig. 3.2 Electrolytic refining of copper. The electrolyte is a solution of
acidified copper sulphate. The anode is impure copper, whereas, the cathode is a
strip of pure copper. On passing electric current, pure copper is deposited on
the cathode.
