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Question

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?

A
Metal sulphides are thermodynamically more stable than CS2
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B
CO2 is thermodynamically more stable than CS2
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C
Metal sulphides are less stable than the corresponding oxides
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D
CO2 is more volatile than CS2
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Solution

The correct option is C Metal sulphides are less stable than the corresponding oxides
The reduction of metal sulfides by the carbon reduction process is not spontaneous as the change in Gibb's free energy (G) for such a process is positive.

The reduction of metal oxides by the carbon reduction process is spontaneous as G for such a process is negative.

Thus CO2 is more stable than CS2 and the metal sulfides are more stable than the corresponding oxides.

Hence, the factor listed in option C is of no significance.

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