Consider the following statements regarding roasting. It is carried out to
i) convert sulphide to oxide and sulphate
ii) remove water of hydration
iii) remove water of hydration
iv) remove arsenic and sulphur impurities

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i and iv are correct

i, ii, and iii are correct

ii, iii, and iv are correct

i, ii, and iv are correct

answer is C.

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Detailed Solution

Roasting is the method in which ore is heated in the presence of air. It is applied for sulphide ore to convert sulphide to oxide and sulphate. It removes water of hydration. Roasting removes arsenic and sulphur impurities.

Hence, option (C) is correct.

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