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  4. Calcination is the process of heating the ore

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Q. Calcination is the process of heating the ore

General Principles and Processes of Isolation of Elements

Solution:

Calcination is the heating of the ore in a suitable furnace in absence of air much below its melting point to cause decomposition and elimination of volatile products.
$PbCO_3 \rightarrow PbO + CO_2$
The process is generally applied to hydrated oxide or carbonate ores.