Question

$KMn{O}_4$ acts as an oxidising agent in an alkaline medium. When alkaline $KMn{O}_4$ is treated with $KI,$ the iodide ion is oxidised to ____________.

• A. $I{O}^{-}$
• B. $I{O}_4^{-}$
• C. $I_2$
• D. $I{O}_3^{-}$

Answer 1

The correct option is D $I{O}_3^{-}$

When alkaline $KMn{O}_4$ reacts with $KI,$ the following reaction takes place:

$\begin{array}{c}2Mn{O}_4^{-}+H_{2}O+I^{-}\stackrel{Alkalinemedium}{\to }\\ 2Mn{O}_2+2O{H}^{-}+I{O}_3^{-}\end{array}$

Thus, when alkaline $KMn{O}_4$ reacts with $KI,$ the iodide ion is oxidised to $I{O}_3^{-}$ ion.

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