JEE Main 2008 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main 2008

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?

(1)Metal sulphides are thermodynamically more stable than
(2) is thermodynamically more stable than
(3)Metal sulphides are less stable than the corresponding oxides
(4) is more volatile than Correct

Answer: (4)

Solution

Carbon cannot reduce a metal sulphide because is thermodynamically less stable than metal sulphides ( of is positive), whereas is very stable, so carbon readily reduces oxides; and oxides are more easily reduced than sulphides. Statements (1), (2) and (3) are thus

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Question ID VK-039067