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Which of the following considerations is not relevant to the practice of first roasting sulphide ores to their oxides instead of reducing the sulphides directly with carbon?

1. Metal sulphides are thermodynamically more stable than CS2
2. CO2 is thermodynamically more stable than CS2
3. Metal sulphides are less stable than the corresponding oxides
4. CO2 is more volatile than CS2

Correct answer: Metal sulphides are less stable than the corresponding oxides

Solution

This option is correct because the stability of metal sulphides compared to their oxides is not a relevant consideration for the roasting process; instead, the focus is on the thermodynamic favorability of the roasting reaction itself.

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