Which of the following statement regarding the advantage of roasting of sulfide ore before reduction is not true

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Roasting of sulfide to the oxide is thermodynamically more feasible

$Δ G_{f}^{o}$ is more negative for roasting sulphide ore to oxide

Carbon and hydrogen are suitable reducing agents for metal sulphides

$Δ G_{f}^{o}$ of the metal sulphide is greater than those of CS₂ and H₂S

answer is B.

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Detailed Solution

Compared to CS₂ and H₂S, the majority of sulfides have greater negative standard free energies of formation (△Gf0). Therefore, metal sulfides cannot be reduced to metal by either carbon or hydrogen. When compared to SO2, the typical free energy of oxide production are substantially lower. As a result, metal oxide oxidation is thermodynamically favorable. Sulfur is thus thermodynamically advantageous. Thus, before reduction, sulfide ore is roasted to the oxide.

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