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Group 16 ElementsP Block elements G15-18

What happens when $SO_{2}$ is passed through an aqueous solution of Fe(III) salt?

Expert Answer

It reduces iron(III) to iron(II): $2Fe^{3+} + SO_{2} + 2H_{2}O \rightarrow 2Fe^{2+} + SO_{4}^{2-} + 4H^{+}$ .

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