Name a substance other than sulphur that would react with dry air on heating to form sulphur dioxide.

Copper sulphate

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Iron pyrite

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Chalcopyrite

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Ferric oxide

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Solution

The correct option is B
Iron pyrite

Sulphur dioxide is produced by roasting iron pyrites in the air.

$4 F e S_{2} + 11 O_{2} \to 2 F e_{2} O_{3} + 8 S O_{2}$

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