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Which of the following options are observed during roasting?

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Convert sulphide to oxide and sulphate

Remove water of hydration

Melt the ore

Remove arsenic and sulphur impurities

answer is A, B, D.

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Detailed Solution

Convert sulphide to oxide and sulphate, Remove water of hydration and Remove arsenic and sulphur impurities are observed during roasting.

Roasting involves conversion of sulphide to oxide and sulphate.

The following reaction will obtain,

$2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 2 S O_{2}$

$2 Z n S + 3 O_{2} \to 2 Z n O + 2 S O_{2}$

It also removes water of hydration as well as it melts the ore.

Hence the option A, B, D is correct.

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