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Confused! kindly explain, 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?

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?

  • Option 1)

    CO_{2} is more volatile than  CS_{2}

  • Option 2)

    Metal sulphides are thermodynamically more stable than CS_{2}

  • Option 3)

    CO_{2} is thermodynamically more stable than  CS_{2}

  • Option 4)

    Metal sulphides are less stable than the corresponding oxides

 
Answers (1)
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As we learnt in

Roasting -

It is heating of the ore in presence of air below its fusion temperature.

- wherein

2PbS +3O3 \rightarrow 2PbO + 2SO2

 

The reduction of metal sulphides by carbon reduction has positive  \Delta G whereas, \Delta G is negative for the same process with metal oxides. So, metal sulphides are more stable than oxides. 

 


Option 1)

CO_{2} is more volatile than  CS_{2}

This option is incorrect.

Option 2)

Metal sulphides are thermodynamically more stable than CS_{2}

This option is incorrect.

Option 3)

CO_{2} is thermodynamically more stable than  CS_{2}

This option is incorrect.

Option 4)

Metal sulphides are less stable than the corresponding oxides

This option is correct.

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