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In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu_{2}O with

(i) \; FeS

(ii) \; CO

(iii) \; Cu_{2}S

(iv) \; SO_{2}

Answers (1)

The answer is option (iii). In the process of extracting copper from its sulphide ore, the metal is formed by the reduction of Cu_{2}O with Cu_{2}S 

Since copper is reduced by itself, the process is known as auto-reduction.

The chemical reaction occurring in this reaction is Cu_2 O+\frac{1}{2} Cu_2 S\rightarrow 3Cu+\frac{1}{2} SO_2

In this process, copper appears as blister copper.

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