Read the following passage and answer the questions that follow: An electrochemical process is used for refining metals by selectively dissolving and…

(a) During electrolytic refining of a metal, the insoluble impurities which settle down at the bottom of the anode is called anode mud.

(b) Anode: Impure copper rod Cathode: Pure copper strip

(c) (i) \(\displaystyle 2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2}(\mathrm{~g}) \xrightarrow{\text { heat }} 2 \mathrm{Cu}_{2} \mathrm{O}(\mathrm{s})+2 \mathrm{SO}_{2}(\mathrm{~g})\) \(\displaystyle 2 \mathrm{Cu}_{2} \mathrm{O}+\mathrm{Cu}_{2} \mathrm{~S} \xrightarrow{\text { heat }} 6 \mathrm{Cu}(\mathrm{s})+\mathrm{SO}_{2}(\mathrm{~g})\)