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Question

Write a balanced chemical equation for the following reaction
SO2 gas is passed through an aqueous solution of a Fe(lll) salt.

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Solution

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 (Fe+3) ions to ferrous (Fe+2) ions.
2Fe3++SO2+2H2O2Fe2++SO42+4H+

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