Question

Copper is extracted from sulphide ore using the method:

• A. Carbon reduction
• B. Carbon monoxide reduction
• C. Auto reduction
• D. None of these

Answer 1

The correct option is C Auto reduction

The copper can be extracted from its sulphide ore by the auto reduction process.

The ore is reduced by heat alone.

$C{u}_{2}S+O_2\to 2Cu+S{O}_2$

The copper and the oxygen have been reduced (decrease in oxidation state). The sulphur has been oxidised (increase in oxidation state). The reducing agent is the sulphide ion in the copper(I) sulphide.

Hence, the correct option is $C$