A sulphide ore like ZnS is first roasted into its oxide pri…

Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

A sulphide ore like ZnS is first roasted into its oxide prior to reduction by carbon because :

A sulphide ore cannot be reduced to metal at all

No reducing agent is found suitable for reducing a sulphide ore.

The Gibb’s free energy of formation of most sulphides are greater than that for CS2.

A metal oxide is generally less stable than the metal sulphide.

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The Gibb’s free energy of most sulphides are greater than that for CS2. In fact, CS2 is an endothermic compound. Therefore, the Δ fG0 of MxS is not compensated. So reduction of MxS is difficult. Hence it is common practice to roast sulphide ores to corresponding oxides prior to reduction.

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