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Standard XII
Chemistry
Introduction to Oxidation and Reduction
Question
Sulphur dioxide bleaches colouring matter by ___________.
dehydration
oxidation
decomposition
reduction
A
decomposition
B
reduction
C
dehydration
D
oxidation
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Solution
Verified by Toppr
Sulphur dioxide bleaches coloring matter by reduction. Bleaching action of sulphur dioxide is not permanent.
S
O
2
(
g
)
+
2
H
2
O
→
H
2
S
O
4
(
a
q
)
+
2
[
H
+
]
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