Which of the following processes is related with the removal of sulphur by heating in the air?

Smelting

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Calcination

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Annealing

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Roasting

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Solution

The correct option is C Roasting
Roasting is a process of heating the concentrated ore (generally sulphide ore)
strongly in the excess of air or $O_{2}$ below its melting point. The free S atom is converted to sulphur dioxide.

$2 Z n S + 3 O_{2} \to 2 Z n O + 2 S O_{2}$

$Z n S + 2 O_{2} \to Z n S O_{4}$

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