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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Sulphur allotropes, SO2, sulphuric acid, oxyacids of sulphur

NEET levelSingle correct optionDifficulty 1 of 3pn076

Moist sulphur dioxide bleaches coloured flowers by

Areduction, and the bleaching is temporary
Boxidation, and the bleaching is permanent
Coxidation, and the bleaching is temporary
Dreduction, and the bleaching is permanent

Answer: A

SO X_{2} + 2 H X_{2} O H X_{2} SO X_{4} + 2 [H]

. The nascent hydrogen reduces the coloured substance; on standing in air the product is re-oxidised and the colour returns, so the bleaching is temporary.

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