Question

Which is an example of autoreduction?

Answer 1

1. Autoreduction is a chemical reaction in which by the reactant is reduced itself.
2. Reduction of ${\mathrm{Cu}}^{+}$ into $\mathrm{Cu}$ in the given reaction is an example of autoreduction:
3. ${\mathrm{Cu}}_2\mathrm{O}\left(\mathrm{s}\right)+\frac{1}{2}{\mathrm{Cu}}_2\mathrm{S}\left(\mathrm{s}\right)\to 3\mathrm{Cu}\left(\mathrm{s}\right)+\frac{1}{2}{\mathrm{SO}}_2\left(\mathrm{g}\right)$