A sulphide ore like ZnS is first roasted into its oxide prior to reduction by carbon because:
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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 Gibb's free energy of formation of most sulphides are greater than that for CS2.
d
a metal oxide is generally less stable than the metal sulphide.
answer is C.
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Detailed Solution
The Gibb's free energy of most sulphides are greater than that for CS2. In fact, CS2 is an endothermic compound. Therefore, the ΔfG∘of MxS is not compensated. So reduction of MxS is difficult. Hence it is common practice to roast sulphide ores to corresponding oxides prior to reduction.