MCQ
$KMnO_4$  acts as an oxidizing agent in weak alkaline medium. When weak alkaline $KMnO_4$  is treated with $KI,$   iodide ion is oxidized to $.........$
  • A
    $I_2$
  • B
    $IO^-$
  • $IO^-_3$
  • D
    $IOO^-_4$

Answer

Correct option: C.
$IO^-_3$
c
$2 \mathrm{KMnO}_{4}+\mathrm{H}_{2} \mathrm{O}+\mathrm{KI} \rightarrow 2 \mathrm{MnO}_{2}+2 \mathrm{KOH}+\mathrm{KIO}_{3}$

$\mathrm{I}+6 \mathrm{OH}^{-} \rightarrow \mathrm{IO}_{3}^{-}+3 \mathrm{H}_{2} \mathrm{O}+6 \mathrm{e}^{-}$

When alkaline KMnO4 is treated with KI, I - is oxidised to IO $_{3}$. .

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