Question

______ is the process of heating the concentrated ore at a temperature below its melting point in the presence of air inorder to convert it into its oxide ore.

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

Answer 1

The correct option is C Roasting

Roasting is a process of heating the concentrated ore at the temperature below its melting point in the presence of air.

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:
$\text{2ZnS(s)}+{\text{3O}}_2\text{(g)}\to \text{2ZnO(s)}+{\text{2SO}}_2\text{(g)}$