Which are the correct statements about K...

Which are the correct statements about `KMnO_(4)` -

its solution is unstable in acidic medium

a small quantity of it, when added to concentrated `H_(2)SO_(4)` solution, a green coloured solution containing `MnO_(3)` ions is formed

`MnO_(4)^(-)` changes to `Mn^(2+)` in basic solution

it acts as a self - indicator in `Fe^(2+)` or `C_(2)O_(4)^(2-)` titration

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The correct Answer is:

A, B, D

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