SATHEE: The dand fblock elements - Result Question 39

The dand fblock elements - Result Question 39

####39. Name the gas that can readily decolourise acidified $K M n O_{4}$ solution :

[2017]

(a) $S O_{2}$

(b) $N O_{2}$

(c) $P_{2} O_{5}$

(d) $C O_{2}$

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Solution:

(a) Potassium permanganate has a purple colour. When sulphur dioxide reacts with potassium permanganate, the solution decolourises.

$5 S O_{2} + 2 K M n O_{4} + 2 H_{2} O \to 2 H_{2} S O_{4} + 2 M n S O_{4}$ $+ K_{2} S O_{4}$

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