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Q.

Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true?

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a

ΔfGΘ of the sulphide is greater than  CS2 and H2S

b

ΔfGΘ is negative for roasting of sulphide ore to oxide

c

Roasting of the sulphide to oxide is thermodynamically feasible

d

Carbon and hydrogen are suitable reducing agents for metal sulphides

answer is D.

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Detailed Solution

ΔfGΘ for sulphides  >ΔfGΘ for CS2 and H2S and thus C and H2cannot reduce metal sulphide.
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