Which is not the true statement about $KMnO_4$?
- AIts solution is unstable in acidic medium
- BIt gets reduced to $MnO_2$ in neutral medium
- C$MnO_4^-$ changes to $Mn^{+2}$ in basic medium
- DIt is self indicator in $Fe^{+2}$ or $C_2O_4^{-2}$ titration
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