Which of the following reactions is an example

Question:

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

Solution:

Option (iv) is the answer.

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