$2MnO_4^{-} + 5H_2O_2 + 6H^{+} \to 2Z + 5O_2 + 8H_2O$. In this reaction $Z$ is

  • A
    $Mn^{2+}$
  • B
    $Mn^{4+}$
  • C
    $MnO_2$
  • D
    $Mn$

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