Question

A sulphide ore is converted into metal oxide by the process of ______.

Options

• carbonation

• roasting

• calcination

• anodising

Answer 1

A sulphide ore is converted into metal oxide by the process of roasting.

Explanation:

Roasting is the chemical process of converting a sulphide ore into a metal oxide by heating it strongly below its melting point in the presence of excess air or oxygen. This reaction drives away sulphur impurities as volatile sulphur dioxide (SO₂) gas, leaving behind the metal oxide, which is far easier to reduce into pure metal.