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  • Which of the following reactions is an example of autoreduction ?

Which of the following reactions is an example of autoreduction ?

(i) \text {Fe}_{3}\text {O}_{4}+\text {4CO}\rightarrow \text {3Fe}+\text {4CO}_{2}

(ii) \text {Cu}_{2}\text {O}+\text {C}\rightarrow \text {2Cu}+\text {CO}

(iii) \text {Cu}^{2+}(aq)+Fe (s)\rightarrow \text {Cu (s)}+Fe^{2+}(aq)

(iv) \text {Cu}_{2}\text {O}+\frac{1}{2}\text {Cu}_{2}\text {S}\rightarrow \text {3Cu }+\frac{1}{2}\text {SO}_{2}

Answers (1)

\text {Cu}_{2}\text {O}+\frac{1}{2}\text {Cu}_{2}\text {S}\rightarrow \text {3Cu }+\frac{1}{2}\text {SO}_{2}

In this reaction reduction of copper (I) oxide by copper (I) sulphide takes place. Since, copper is reduced by itself, this process is known as auto-reduction and the solidified copper so, obtained is known as blister copper. We get the copper metal on reaction of sulphide ore of copper with its oxide.

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