Answer:
The electrolytic reduction takes
place at the cathode by the gain of electrons in electrolysis. At the same
tune, carbon reduction is carried by heating a metal oxide with coke. For
example,
\[NaCl\text{(molten)}\,\xrightarrow{\text{(Electrolysis)}}\,N{{a}^{+}}\,+C{{l}^{-}}\]
\[N{{a}^{+}}+{{e}^{-}}\xrightarrow{\,}\,Na\]
(Reduction by the gain of electrons)
\[ZnO+\underset{(Coke)}{\mathop{C}}\,\,\,\xrightarrow{Heat}\,Zn+CO\]
(Reduction by carbon)
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