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

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The enthalpy of formation of CO2 is more than that of CS2

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

answer is A.

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Detailed Solution

Carbon is usually used for the reduction of ores and if sulphide ores are used, it will form CS2 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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