Sulphide ores are converted into oxides by heating them strongly in excess of air. This process is known as

calcination

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roasting

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poling

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None of the above

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Solution

The correct option is B roasting
Roasting is a pyrochemical process in which the ore is heated in the presence of oxygen or air below its melting point. The products like metal oxide and sulphide ore etc., obtained are in solid state.

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