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QJEEM08Che469: JEE Main 2008 Chemistry - Class 12 JEEM08Che469 Solution: Which of the following factors is of no significance for…

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?

Multiple Choice Options

  • 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

Step-by-Step Verified Solution

NOTE : The reduction of metal sulphides by carbon reduction process is not spontaneous because ΔG for such a process is positive. The reduction of metal oxide by carbon reduction process is spontaneous as ΔG for such a process is negative.

From this we find that on thermodynamic considerations CO2 is more stable than CS2 and the metal sulphides are more stable than corresponding oxides.

In view of above the factor listed in choice (c) is incorrect and so is of no significance.

Hence the correct answer is (c)

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