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
(b) CO₂ is thermodynamically more stable than CS₂
(c) Metal sulphides are less stable than the corresponding
oxides
(d) CO₂ is more volatile than CS₂
Answers
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Metal sulphides are less stable than the corresponding oxides.
Explanation:
- The stability of a compound is measured by the Gibbs free energy.
The change in Gibbs free energy for a reduction of metal sulphide is positive.
- While the change in Gibbs's free energy for reduction of metal oxide is negative.
- We know that the negative change in Gibbs's free energy makes the reaction more spontaneous.
- Metal roasting is the process by which metals are oxidised in presence of oxygen or air to produce their oxides from other compounds.
- So the option saying Metal sulphides are less stable than the corresponding oxidesis false.
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