Explanation:
In a reduction-half reaction, there is gain of electrons.
For example, [tex]Ag^{+} + 1e^{-} \rightarrow Ag[/tex]
Whereas in an oxidation-half reaction, there is loss of electrons.
For example, [tex]Cu \rightarrow Cu^{2+} + 2e^{-}[/tex]
Thus, we can conclude that the equation Cu → cu2 2e– represents oxidation-half reaction.
