JEE Main Chemistry question

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

Not in JEE Main or NEET syllabus

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? [AIEEE 2008]

(A)Metal sulphides are thermodynamically more stable than
(B) is thermodynamically more stable than
(C)Metal sulphides are less stable than the corresponding oxidesCorrect
(D) is more volatile than

Answer: (C)

Solution

Since metal sulphides are generally more stable than the corresponding oxides (the opposite of what option C claims), direct carbon reduction of the sulphide (which would require forming the even less favourable ) is thermodynamically unfavourable; this is why ores are first roasted to the oxide (since

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Question ID VK-145277