Which Of The Following Factors Is Of no Significance for Roasting Sulphide Ores To The Oxidexs And Not Subjecting The Sulphide Ores To Carbon Reduction Directly?

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Question

Which of the following factors is of no significance for roasting sulphide ores to the oxidexs and not subjecting the sulphide ores to carbon reduction directly?

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Solution

Correct option is

Metal sulphides are less stable then the corresponding oxides

The value of âˆ†G for the formation of CO₂ is negative, ie, it is thermodynamically more stable than CS₂. Also metal sulphides are thermodynamically more stable than CS₂. Metal sulphides are more stable than the corresponding oxides, so they are roasted to convert into less stable oxides.