$K M n O_{4}$ acts as an oxidising agent in an alkaline medium. When alkaline $K M n O_{4}$ is treated with $K I,$ the iodide ion is oxidised to ____________.

I O^{-}

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I O_{4}^{-}

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I_{2}

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I O_{3}^{-}

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Solution

The correct option is D $I O_{3}^{-}$
When alkaline $K M n O_{4}$ reacts with $K I,$ the following reaction takes place:

$\begin{matrix} 2 M n O_{4}^{-} + H_{2} O + I^{-} A l k a l i n e m e d i u m - --------- \to 2 M n O_{2} + 2 O H^{-} + I O_{3}^{-} \end{matrix}$

Thus, when alkaline $K M n O_{4}$ reacts with $K I,$ the iodide ion is oxidised to $I O_{3}^{-}$ ion.

So, the correct answer is option $(C) .$

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