Acidified ${KMnO}_{4}$ can be decolourised by

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$H_{2} O_{2}$

${FeSO}_{4}$

${SO}_{2}$

${Fe}_{2} {({SO}_{4})}_{3}$

answer is A, B, C.

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Detailed Solution

Acidified ${KMnO}_{4}$ solution is easily decolored by SO2. The colour ${KMnO}_{4}$ of is purple. While ${KMnO}_{4}$ is an oxidising agent and decolorizes when exposed to sulphur dioxide gas, the latter works as a reducing agent.

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