During the extraction of copper from copper matter i.e. sulphide ore of copper, sulphur is removed by formation of sulphur dioxide upon passing hot air. As a result, cuprous oxide is formed which is then reduced by copper sulphide to give copper. The reaction is - 2 2 2 2Cu O+Cu S 6Cu+SO → Therefore, the correct answer is option (a) Copper (1) sulphide 2 (Cu S) .
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