Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?
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a
CO2 is more volatile than CS2
b
Metal sulphides are thermodynamically more stable than CS2
c
CO2 is thermodynamically more stable than CS2
d
Metal sulphides are less stable than the corresponding oxides
answer is B.
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Detailed Solution
Metal sulphides reduction with carbon is not possible since ΔfGΘ for the reaction is not compensated.