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Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the oxides and not subjecting the sulphide ores to carbon reduction directly ?
Metal sulphides are thermodynamically more stable than $CS_2$
$CO_2$ is thermodynamically more stable than $CS_2$
Metal sulphides are less stable than the corresponding oxides
$CO_2$ is more volatile than $CS_2$
Solution
The reduction of metal sulphides by carbon reduction process is not spontaneous because $\Delta G$ for such a process is positive. The reduction of metal oxide by carbon reduction process is spontaneous as $\Delta G$ for such a process is negative.
From this we find that on thermodynamic considerations $C O_{2}$ is more stable than $C S_{2}$ and the metal sulphides are more stable than corresponding oxides.
