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Q.

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.
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