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What happens when sulphur dioxide is passed through an aqueous solution of Fe (III) salt?

7.20     What happens when sulphur dioxide is passed through an aqueous solution of Fe(III) salt?

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When we pass sulphur dioxide  through an aqueous solution of Fe(III) salt, it converts iron(III) ions to iron(II) ions.

2Fe^{3+}+SO_2+2H_20\rightarrow 2Fe^{2+}+SO_4^{2-}+4H^+

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