Heating pyrites to remove sulphur is called:

smelting

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calcination

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liquation

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roasting

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Solution

The correct option is D roasting
In roasting, the ore is heated in a regular supply of air in a furnace at a temperature below the melting point of the metal.
Some of the reactions involving sulphide ores are:
$2 Z n S + 3 O_{2} \to 2 Z n O + 2 S O_{2}$
$2 P b S + 3 O_{2} \to 2 P b O + 2 S O_{2}$
$2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 2 S O_{2}$
Hence,option D is correct answer.

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Heating of an ore in the presence of air to remove impurities containing sulphur is called:

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