Which of the following reactions is an example of autoreduction?

(i) Fe3O4 + 4CO → 3Fe + 4CO2

(ii) Cu2O + C → 2Cu + CO

(iii) Cu2+ (aq) + Fe (s) → Cu (s) + Fe2+ (aq)

(iv) Cu2O +1/2Cu2S → 3Cu+1/2SO2.

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(iv) Cu2O +1/2Cu2S → 3Cu+1/2SO2.

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