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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?
- #Chemistry
- #Joint Entrance Examination Main
- #General Principle and process of Isolation of metals
- #Engineering
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)
is more volatile than
- Option 2)
Metal sulphides are thermodynamically more stable than
- Option 3)
- Option 4)
Metal sulphides are less stable than the corresponding oxides
Answers (1)
As we learnt in
Roasting -
It is heating of the ore in presence of air below its fusion temperature.
- wherein
2PbS +3O3 2PbO + 2SO2
The reduction of metal sulphides by carbon reduction has positive whereas,
is negative for the same process with metal oxides. So, metal sulphides are more stable than oxides.
Option 1)
is more volatile than
This option is incorrect.
Option 2)
Metal sulphides are thermodynamically more stable than
This option is incorrect.
Option 3)
is thermodynamically more stable than
This option is incorrect.
Option 4)
Metal sulphides are less stable than the corresponding oxides
This option is correct.
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