Q.

Bleaching action of moist sulphur dioxide is because of its –

A. basic property
B. acidic property
C. oxidising property
D. reducing property
Answer» C. oxidising property
Explanation: In moist conditions, sulphur dioxide is a bleaching agent. In the reducing action of SO2, oxygen is removed from coloured dye. Sulphur dioxide is used to bleach wool and silk. Salts of sulphur dioxide are also used in bleaching. Calcium hydrogen sulphite Ca(HSO3)2 is used to whiten wood pulp in the manufacturing of paper.
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