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  • To an acid solution of an anion a few drops of solution are added. Which of the fol

To an acid solution of an anion a few drops of \mathrm{KMnO}_{4} solution are added. Which of the following, if present will not decolourise the \mathrm{KMnO}_{4} solution?

Option: 1

\mathrm{NO}_{3}^{-}


Option: 2

\text{S}^{2-}


Option: 3

\mathrm{Cl}^{-}


Option: 4

\mathrm{CO}_{3}^{2-}


Answers (1)

best_answer

Except \text{CO}_{3}^{2-} all other ions will be oxidised by \text{KMnO}_{4} solution. \text{CO}_{3}^{2-} contains carbon in its highest oxidation state of (+4) and cannot be further oxidised.

Hence, the correct answer is Option (4)

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