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What happens when sulphur dioxide is passed through an aqueous

Question

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

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What happens when sulphur dioxide is passed through an aqueous solution of

F e (III)

salt?

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Text solutionVerified

S O_{2}

acts as a reducing agent and reduces an aqueous solution of

F e (III)

salt to

F e (II)

salt, given by the equation.

S O_{2} + 2 H_{2} O \to S O_{4}^{2 -} + 4 H^{+} + 2 e^{-}

2 F e^{3 +} + 2 e^{-} \to 2 F e^{2 +}

\overline{2 F e^{3 +} + S O_{2} + 2 H_{2} O \to 2 F e^{2 +} + S O_{4}^{2 -} + 4 H^{+}}

This is indicated by the removal of green colour and formation of a light brown colour.

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Question Text	What happens when sulphur dioxide is passed through an aqueous solution of $F e (III)$ salt?
Answer Type	Text solution:1
Upvotes	150