Question

Heating of carbonate ore in absence of air is called

• A. calcination
• B. roasting
• C. smelting
• D. refining

Answer 1

The Correct Option is A

Calcination is the process of heating carbonate ores in the absence or limited supply of air. This is done to remove volatile impurities or to convert the ore into its oxide form. For example: \[ CaCO_3 \xrightarrow{\Delta} CaO + CO_2 \] Roasting, on the other hand, involves heating in the presence of excess air and is generally used for sulfide ores.

The correct answer is option (A): calcination