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

`CO_(3)^(2-)`

B

`NO_(2)^(-)`

C

`SO_(3)^(2-)`

D

`Cl^(-)`

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The correct Answer is:

A

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