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  4. KMnO4 acts as an oxidising agent in alkaline medium. When alkaline KMnO4 is treated with KI, iodide ion is oxidised to

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Q. $KMnO_4$ acts as an oxidising agent in alkaline medium. When alkaline $KMnO_4$ is treated with KI, iodide ion is oxidised to

KCETKCET 2018The d-and f-Block Elements

Solution:

$
2 KMnO _{4}+ H _{2} O + KI \rightarrow 2 MnO _{2}+2 KOH + KIO _{3}
$
$
I +6 OH ^{-} \rightarrow IO _{3}^{-}+3 H _{2} O +6 e ^{-}
$
When alkaline $KMnO _{4}$ is treated with $KI , I ^{-}$is oxidised to $IO _{3}{ }^{-}$.