Q40 / 116 · NTA Abhyas (NEET) 2020 · Chemistry · General Principles and Processes of Isolation of Metals

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
    CO2 is more volatile than CS2
  • Correct answer
    B
    Metal sulphides are thermodynamically more stable than CS2
  • C
    CO2 is thermodynamically more stable than CS2
  • D
    Metal sulphides are less stable than the corresponding oxides

Solution

Metal sulphides are more stable than corresponding oxides and that is why they are more difficult to extract metal from sulphide ores. To make the extraction easy and economical , first these sulphides are converted into corresponding oxides and from these oxides metal is easily extracted by reducing them with carbon.

Hence, the correct answer is option: 'B'.

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