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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.
2ZnS+3O22ZnO+2SO2
ZnS+2O2ZnSO4
The water of hydration is removed.
The volatile Arsenic and Sulphur impurities are removed.

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