Question

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

Options

• copper (I) sulphide (Cu₂S)

• sulphur dioxide (SO₂)

• iron sulphide (FeS)

• carbon monoxide (CO)

Answer 1

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with copper (I) sulphide (Cu₂S).

Explanation:

In the extraction of copper from copper pyrites (CuFeS₂), copper is finally obtained by self-reduction. During roasting, Cu₂O and Cu₂S are formed. These two compounds react as follows:

\[\ce{Cu2O + Cu2S -> 4Cu + SO2}\]

So, Cu₂O is reduced by Cu₂S to form pure copper and sulphur dioxide gas.