Which one of the following species is stable in aqueous solution ?

  • [JEE MAIN 2016]
  • A

    $Cr^{2+}$

  • B

    $MnO_4^{2 - }$

  • C

    $MnO_4^{3 - }$

  • D

    $Cu^+$

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  • [AIIMS 2002]