Question

After partial roasting, the sulphide of copper is reduced by ______.

Options

• cyanide process

• electrolysis

• reduction with carbon

• self-reduction

Answer 1

After partial roasting, the sulphide of copper is reduced by self-reduction.

Explanation:

Reduction of oxide ore of a metal by its own sulphide.

\[\ce{2Cu2O + CuS -> 3Cu + SO2}\]