Which of the following statements about the advantage of roasting o...

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Which of the following statements about the advantage of roasting of sulphide ore before smelting is not true ?
(a) \( \Delta_{f} G^{\circ} \) of the sulphide is more negative than that of \( \mathrm{CS}_{2} \).
(b) \( \Delta_{f} G^{\circ} \) is negative for roasting of sulphide ore to oxide.
\( \mathrm{P} \)
(c) \( \Delta_{f} G^{\circ} \) carbon reduction of metal oxide to free metal is more negative at higher temperature.
(d) Carbon and hydrogen are suitable reducing agents for metal sulphides.
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