On treating $SO_2$ with an aqueous solution of $KMnO_4$,the manganese ion reduces to

  • A
    $Mn^{2+}$ only
  • B
    $Mn^{4+}$ only
  • C
    $Mn^{6+}$ only
  • D
    $Mn^{4+}$ and $Mn^{6+}$

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