A sulphide ore like \( \mathrm{ZnS} \) is first roasted into its oxide prior to reduction by car...

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A sulphide ore like \( \mathrm{ZnS} \) is first roasted into its oxide prior to reduction by carbon because:
(a) A sulphide ore cannot be reduced to metal at all.
(b) No reducing agent is found suitable for reducing a sulphide ore.
(c) The gibbs free energy of formation of most sulphides are less than that for \( \mathrm{CS}_{2} \).
(d) A metal oxide is generally less stable than the metal sulphide.
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