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

1. A. The G f of the sulphide is greater than those for CS2 and H2S .
2. B. The G f is negative for roasting of sulphide ore to oxide.
3. C. Roasting of the sulphide to the oxide is thermodynamically feasible.
4. D. Carbon and hydrogen are suitable reducing agents for metal sulphides.

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