Disproportionation of $1 \ mol$ of $MnO_4^{2-}$ in neutral aqueous solution results in which of the following?
- A$\frac{2}{3} \ mol$ of $MnO_4^-$ and $\frac{1}{3} \ mol$ of $MnO_2$
- B$\frac{1}{3} \ mol$ of $MnO_4^-$ and $\frac{2}{3} \ mol$ of $MnO_2$
- C$\frac{2}{3} \ mol$ of $Mn_2O_7$ and $\frac{1}{3} \ mol$ of $MnO_2$
- D$\frac{2}{3} \ mol$ of $Mn_2O_7$ and $\frac{1}{3} \ mol$ of $Mn_2O_3$
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