$2MnO_4^{-} + 5H_2O_2 + 6H^{+} \to 2Z + 5O_2 + 8H_2O$. In this reaction $Z$ is
- A$Mn^{2+}$
- B$Mn^{4+}$
- C$MnO_2$
- D$Mn$
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