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Which of the following equations represents the oxidising action of sulphur dioxide?

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2 {Fe}^{3 +} + {SO}_{2} + 2 H_{2} O \to 2 {Fe}^{2 +} + {SO}_{4}^{2 -} + 4 H^{+}

3 Fe + {SO}_{2} \to 2 FeO + FeS

2 {MnO}_{4}^{-} + 2 H_{2} O + 5 {SO}_{2} \to 2 {Mn}^{2 +} + 4 H^{+} + 5 {SO}_{4}^{2 -}

{Cr}_{2} O_{7} + {SO}_{2} + H_{2} {SO}_{4} \to K_{2} {SO}_{4} + {Cr}_{2} {({SO}_{4})}_{3} + H_{2} O

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detailed solution

Correct option is B

$3 Fe + {SO}_{2} \to 2 FeO + FeS$

Here ${SO}_{2}$ acts as an oxidising agent and thus oxidises $Fe$ to S.

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