When a few drops of KMnO_4 are added to an ac | vedclass

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(A) $KMnO_4$ acts as an oxidizing agent and gets decolorized upon reduction.For an anion to decolorize $KMnO_4$,it must be capable of being oxidized.I

Vedclass · Accepted Answer

$CO_3^{2-}$

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(A) $KMnO_4$ acts as an oxidizing agent and gets decolorized upon reduction.For an anion to decolorize $KMnO_4$,it must be capable of being oxidized.In $CO_3^{2-}$,the oxidation state of $C$ is $+4$,which is its maximum oxidation state.Since $C$ cannot be oxidized further,$CO_3^{2-}$ cannot reduce $KMnO_4$ and thus will not decolorize it.$NO_2^{-}$,$S^{2-}$,and $Cl^{-}$ can be oxidized to $NO_3^{-}$,$S$,and $Cl_2$ respectively,thereby decolorizing $KMnO_4$.

When a few drops of $KMnO_4$ are added to an acidic solution of an anion,which of the following,if present,will $NOT$ decolorize $KMnO_4$?

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