NEET 2007 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)NEET 2007

Not in JEE Main or NEET syllabus

Which of the following statements, about the advantage of roasting sulphide ore before reduction is not true?

(1)Roasting of the sulphide to the oxide is thermodynamically feasible.
(2)Carbon and hydrogen are suitable reducing agents for metal sulphides.Correct
(3)The of the sulphide is greater than those for and .
(4)The is negative for roasting of sulphide ore to oxide.

Answer: (2)

Solution

Roasting converts a sulphide ore into its oxide (releasing ); this reaction has a negative and is thermodynamically feasible, so statements (1) and (4) are true. The of most metal sulphides is less negative (greater) than those of

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Question ID VK-089858