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The process of converting sulphide ores into their oxides by heating strongly and in the presence of excess air is called ________.

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roasting

calcination

reduction

smelting

answer is A.

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Detailed Solution

The process of converting sulphide ores into their oxides by heating strongly and in the presence of excess air is called roasting.

$ZnS + 3 O_{2} \overset{heat}{\to} 2 ZnO + 2 {SO}_{2}$

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