In the extraction of copper from its sulphide ore, the metal is finally obtained

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

(a) carbon monoxide
(b) copper (I) sulphide
(c) sulphure dioxide
(d) iron (II) sulphide

copper (I) sulphide

2Cu₂S (s) +3O₂ (g) →2Cu₂O (s) +2SO₂(g)
The unchanged Cu₂S, mixed with Cu₂O and heated strongly in absence of air
2Cu₂S + 2Cu₂O →6Cu +SO₂.

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