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Which of the following reactions is an example of autoreduction?
(i) \( \mathrm{Fe}_{3} \mathrm{O}_{4}+4 \mathrm{CO} \longrightarrow 3 \mathrm{Fe}+4 \mathrm{CO}_{2} \)
\( \mathrm{P} \)
(ii) \( \mathrm{Cu}_{2} \mathrm{O}+\mathrm{C} \longrightarrow 2 \mathrm{Cu}+\mathrm{CO} \)
(iii) \( \mathrm{Cu}^{2+}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s}) \longrightarrow \mathrm{Cu}(\mathrm{s})+\mathrm{Fe}^{2+}(\mathrm{aq}) \)
W
(iv) \( \mathrm{Cu}_{2} \mathrm{O}+\frac{1}{2} \mathrm{Cu}_{2} \mathrm{~S} \longrightarrow 3 \mathrm{Cu}+\frac{1}{2} \mathrm{SO}_{2} \)
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