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Question:

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

Answer:

SO2 acts as a reducing agent when passed through an aqueous solution containing Fe(III) salt. It reduces Fe(III) to Fe(II) i.e., ferric ions to ferrous ions.

2Fe3+  +  SO2 + 2H2O   →   2Fe2+   +  SO42-   +   4H+


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