Question

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:

• A. Sulphur dioxide $(SO_2)$
• B. Iron sulphide (FeS)
• C. Carbon monoxide (CO)
• D. Copper(I) sulphide $(Cu_2S)$.

Answer 1

Answer: (D)

Copper(I) sulphide $(Cu_2S)$.

Answer 2

In the extraction of copper from its sulphide ore, when ore is subjected to roasting, some of it is oxidised to $Cu_2O$ which reacts with the remaining $Cu_2S$ (sulphide ore) to give copper metal. $Cu_2S + 2Cu_2O \rightarrow 6Cu + SO_2 \uparrow$ Here $Cu_2S$ behaves as reducing agent.