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

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

Solution:

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.