Which of the following reactions is an example of autoreduction ?

Options

A. `Fe_3O_4 + 4CO to 3Fe + 4CO_2`
B. `Cu_2O + C to 2Cu + CO`
C. `Cu^(2+) (aq) + Fe(s) to Cu(s) + Fe^(2+)(aq)`
D. `Cu_2O + 1//2 Cu_2S to 3Cu + 1//2 SO_2`

Answer

D

Explanation

`Cu_2O + 1//2 Cu_2S to 3Cu + 1//2 SO_2`