Which is not the true statement about $KMnO_4$?

  • A
    Its solution is unstable in acidic medium
  • B
    It gets reduced to $MnO_2$ in neutral medium
  • C
    $MnO_4^-$ changes to $Mn^{+2}$ in basic medium
  • D
    It is self indicator in $Fe^{+2}$ or $C_2O_4^{-2}$ titration

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Which one of the following compounds does not decolourise an acidified aqueous solution of $KMnO_4$?

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