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To an aqueous solution containing anions...

To an aqueous solution containing anions a few drops of acidified `KMnO_4` are added. Which one of the following anions, if present will not decolourise the `KMnO_4` solution?

A

`I^(-)`

B

`CO_3^(2-)`

C

`S^(2-)`

D

`NO_2^(-)`

Text Solution

Verified by Experts

The correct Answer is:
B
In `CO_3^(2-)` is present in its higher oxidation state ie,+4 state, so its further oxidation is not possible, it only undergoes reduction.
Acidified `KMnO_4` is a strong oxidising agent, but it cannot oxidise `CO_3^(2-)` . Hence, it will not be decolourised by `CO_3^(2-)`.
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