Question

The process of calcination is used for

• A. Carbonate ores
• B. Sulphide ores
• C. Nitrate ores
• D. Sulphate ores

Answer 1

The correct option is A

Carbonate ores

Explanation of correct answer

Option A

• Calcination is defined as a method where ore is heated strongly in limited quantity of air.
• Calcination, therefore, is sometimes considered a process of purification.
• Calcination is the process of reduction of Carbonate ore in absence of air to its oxides because Carbonate ores can be decomposed in absence of air, that is why this method is used for Carbonate ore only.

Example: Reduction of Calamine ore (Carbonate ore of Zinc)

$$\begin{gathered} {\mathrm{ZnCO}}_3\left(\mathrm{s}\right)\stackrel{∆}{\to }\mathrm{ZnO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right) \\ \mathrm{Calamine}\mathrm{Zinc} \\ \mathrm{ore}\mathrm{oxide} \end{gathered}$$

Hence, the correct option is (A).