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Name the gas can readily de-colourise ac...

Name the gas can readily de-colourise acidified`KMnO_4` solution

A

`CO_2`

B

` NO_2`

C

` P_2 O_5`

D

`SO_2`

Text Solution

Verified by Experts

The correct Answer is:
D
`SO_2` decolourises pink violet colour of acidified `KMnO_4` solution.
` 2 KMnO_4 + 3H_2 SO_4 to K_2 SO_4 + 2 MnSO_4 + 3H_2 O + 5SO_2 + H_2 O + [O] to H_2 SO_4 ] xx 5`
` 2KMnO_4 + 5 SO_2 + 2H_2 O to K_2 SO_4 + 2MnSO_4 + underset("(colourless)")(2H_2 SO_4)`
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