A) Cathode - pure copper Anode- pure zinc
B) Cathode - pure zinc Anode- pure copper
C) Cathode - pure copper Anode- impure copper
D) Cathode - pure zinc Anode- impure zinc
Correct Answer: C
Solution :
Refining of pure copper is done by electrolytic method. In this method anode is of impure copper and pure copper strips are taken as cathode. The electrolyte is acidified solution of copper sulphate and the net result of electrolysis is the transfer of copper in pure form from the anode to cathode. Reactions occur at each electrode are as follows Anode \[Cu-2{{e}^{-}}\xrightarrow{{}}C{{u}^{2+}}\] Cathode \[C{{u}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Cu\] Impurities from the impure copper deposit as anode mud.
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