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Which of the following statement, about the advantage of roasting of sulphide ore before reduction is not true?
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The $\Delta \mathrm{G}_f^{\text {o }}$ of the sulphide is greater than those for $\mathrm{CS}_2$ and $\mathrm{H}_2 \mathrm{~S}$.
The sulphide ore is roasted to oxide before reduction because the $\Delta \mathrm{G}$ of most of the sulphides are greater than those of $\mathrm{CS}_2$ and $\mathrm{H}_2 \mathrm{~S}$, therefore neither $\mathrm{C}$ nor $\mathrm{H}$ can reduce metal sulphide to metal. Further, the standard free energies of formation of oxide are much less than those of $\mathrm{SO}_2$. Hence oxidation of metal sulphides to metal oxide is thermodynamically favourable.
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