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?

Options

A. `CO_2` is more volatile than `CS_2`
B. Metal sulphides are thermodynamically more stable than `CS_2`
C. `CO_2` is thermodynamically more stable than `CS_2`
D. Metal sulphides are less stable than the corresponding oxides

Answer

B

Explanation

Metal sulphides reduction with carbon is not possible since `Delta_f G^(Theta)` for the reaction is not compensated.