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To an acidic solution of an anion, a few...

To an acidic solution of an anion, a few drops of `Kmno_(4)` solution are added. Which of the following, if present, will not decolourise the `KMnO_(4)` solution?

A

`I^-`

B

`CO_3^(2-)`

C

`S^(2-)`

D

`NO_2^-`

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