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  4. When SO2 is passed through a solution of potassium iodate, the oxidation state of iodine changes from

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Q. When $SO_2$ is passed through a solution of potassium iodate, the oxidation state of iodine changes from

Redox Reactions

Solution:

$3 K \overset{\text{ +5 }}{ I}O_3 + 3 SO_3 \rightarrow 3 K \overset{\text{ -1 }}{ I} + 3SO_3$
During this reaction, O.N. of iodine changes from $+ 5$ in $KIO_3$ to - $1$ in $KI$.