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 statements about the advantages of roasting sulphide ore before reduction is not true?

(A) of the sulphide is greater than and
(B) is negative for roasting of sulphide ore to oxide
(C)Roasting of the sulphide to oxide is thermodynamically feasible
(D)Carbon and hydrogen are suitable reducing agents for metal sulphidesCorrect

Answer: (D)

Solution

Direct reduction of a metal sulphide by carbon or hydrogen would require sulphur to be carried away as or ; since metal sulphides are thermodynamically much more stable than / (statement A, true), this direct reduction does not proceed. This is why the sulphide is instead first roasted to the

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Question ID VK-145362