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  4. Heating an ore in the absence of air below its melting point is called:

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Q. Heating an ore in the absence of air below its melting point is called:

EAMCETEAMCET 1998

Solution:

Calcination: It is the process of heating the ore strongly in absence of air. The volatile impurities are removed and the mass becomes porous. Carbonate and oxide ores are generally calcined when they lose moisture, $ \text{C}{{\text{O}}_{\text{2}}} $ and other volatile impurities. $ \underset{\text{Malachite}}{\mathop{\text{CuC}{{\text{O}}_{\text{3}}}\text{Cu(O}{{\text{H}}_{2}}\text{)}}}\,\xrightarrow{\text{Calcination}}2CuO+C{{O}_{2}} $ $ +{{H}_{2}}O $