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Roasting

Consider the ...

Question

Consider the following statements :
Roasting is carried out in order to :
I. convert sulphide to oxide and sulphate
II. remove water of hydration.
III. melt the ore.
IV. remove arsenic and sulphur impurities.
Of these statements select the correct one/s.

A

I, II and III are correct

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B

I and IV are correct

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C

I, II and IV are correct

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D

II, III, and IV are correct

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Solution

The correct option is C I, II and IV are correct
During roasting, sulphide is converted to oxide and sulphate.
$2 Z n S + 3 O_{2} \to 2 Z n O + 2 S O_{2}$
$Z n S + 2 O_{2} \to Z n S O_{4}$
The water of hydration is removed.
The volatile Arsenic and Sulphur impurities are removed.

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