The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as:
(correct answer +1, wrong answer -0.25)

Roasting

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Smelting

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Calcination

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Refining

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Solution

The correct option is A Roasting
The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as roasting.
Example : $2 Z n S + 3 O_{2} \to 2 Z n O + 2 S O_{2}$

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