Question

The process for obtaining oxide from carbonate ore by heating at a high temperature in a limited supply of air is:

• A. Calcination
• B. Roasting
• C. Smelting
• D. Concentration of ore

Hint:

Calcination is used for carbonate ores, whereas roasting is used for sulfide ores.

Answer 1

The Correct Option is A

Calcination is the process of heating carbonate (or hydrated ores) in the absence of air to remove volatile impurities and convert them into their oxide forms. Example: \[ CaCO_3 \xrightarrow{heat} CaO + CO_2 \] This process is different from roasting, which is done in the presence of excess air.