Question

______ is the process of heating the concentrated ore at a temperature below its melting point in excess of air or oxygen.

• A. Calcination
• B. Roasting
• C. Electrolysis
• D. Smelting

Answer 1

The correct option is B Roasting

Roasting is the process of heating the concentrated ore at the temperature below its melting point in excess of air or oxygen.
Sulphide ores are transformed into their oxides by this process.

For example, zinc sulphide is converted to zinc oxide by heating it in the presence of oxygen.

The reaction involved is given below:
$\text{2ZnS(s)}+{\text{3O}}_2\text{(g)}\to \text{2ZnO(s)}+{\text{2SO}}_2\text{(g)}$