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One gas bleaches the colour of flowers b...

One gas bleaches the colour of flowers by reduction, while the other by oxidation, the two gases respectively are:

A

`CO and Cl_2`

B

`H_2S and Br_2`

C

`NH_3 and SO_3`

D

`SO_2 and Cl_2`

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The correct Answer is:
D
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