Q1102
Sulphur dioxide bleaches colouring matter by :
A.
Reduction
AnswerB.
Dehydration
C.
Decomposition
D.
Oxidation
Answer: Option A
Solution
Answer: Option A
Solution:
Sulphur dioxide gas exhibits bleaching properties in presence of moisture. It dissolves in water liberating nascent hydrogen. Nascent hydrogen removes oxygen atoms from the colouring matter (reduces colouring matter) and it loses its colour.