Name the gas that can readily decolourise acidified KMnO4 solution. [2017]

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Solution

Q.
Name the gas that can readily decolourise acidified ${KMnO}_{4}$ solution. [2017]

1 ${SO}_{2}$

2 ${NO}_{2}$

3 $P_{2} O_{5}$

4 ${CO}_{2}$

Ans.
(1)

$S O_{2}$ readily decolourises pink violet colour of acidified ${KMnO}_{4}$ solution.

$\underset{(Pink violet)}{2 {KMnO}_{4}} + 5 {SO}_{2} + 2 H_{2} O ⟶ K_{2} {SO}_{4} + \underset{(Colourless)}{2 {MnSO}_{4}} + 2 H_{2} {SO}_{4}$

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