Giving examples, differentiate between ‘roasting’ and ‘calcination’.

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Solution

Roasting Calcination

$\to$ Heating an ore in excess of air, to remove Heating an ore in the limited supply of air or in

volatile impurities. the absence of air.

$\to$ Generally sulphide ores are roasted. Carbonate ores are calcined.

$\to Z n s + O_{2} \to Z n O + S O_{2}$ $C a C O_{3} Δ \to C a O + C O_{2}$

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