Select the correct statement(s) with respect to the differences between roasting and calcination.

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Combustion reaction occurs in roasting but not in calcination.

Partial fusion occurs in calcination but not in roasting.

In roasting at higher temperature sulphide ores of the some metal like Cu, Pb, Hg etc., are reduced directly to metal but not in calcination

Calcination is done in limited supply of air or absence of air but in roasting supply of exce air is required.

answer is A, C, D.

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Detailed Solution

Calcination results in partial fusion whereas roasting does not. Calcination is carried out with a meagre supply of oxygen or none at all, whereas roasting calls for an abundance of air supply. In contrast to calcination, a combination reaction happens during roasting.

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