A sulphide ore is generally roasted to the oxide before red…

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 11, 2026

A sulphide ore is generally roasted to the oxide before reduction, because -

The enthalpy of formation of CO 2 is more than that of CS 2

A metal sulphide is generally more stable than the metal oxide

No reducing agent is found suitable for reducing a sulphide ore

A sulphide ore cannot be reduced at all

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The correct answer is:

Carbon is usually used for the reduction of ores and if sulphide ores are used, it will form CS 2 which is difficult to remove. Therefore, sulphide ores are first roasted to metal oxides which are then reduced by carbon to give metal and CO escapes easily into the air.

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