Sulphur dioxide bleaches colouring matter by

(A) reduction
(B) dehydration
(C) decomposition
(D) oxidation

Correct Answer : reduction
Explanation : 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.
Useful Quotations for : UPSC, State PSC, IBPS, SSC, Railway, NDA, Police Exams
Like The Facebook Page CurrentGK for Current Affairs, Latest GK & Employment News
Tags : Current Affairs
Always Ask Questions