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

1. The ΔG⁰ of the sulphide is greater than those for CS₂ and H₂S.
2. The ΔG⁰ is negative for roasting of sulphide ore to oxide.
3. Roasting of the sulphide to the oxide is thermodynamically feasible.
4. Carbon and hydrogen are suitable reducing agents for metal sulphides.

Correct answer: Carbon and hydrogen are suitable reducing agents for metal sulphides.

Solution

Carbon and hydrogen are not suitable reducing agents for metal sulphides because their Gibbs free energy change (ΔG⁰) for the reduction of sulphides is not favorable. This makes option D incorrect.

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