One mole of `MnO_(4)^(2-)` disproportionates to yield `:`

Options

A. `2//3` mole of `MnO_(4)^(2-)` and `1//3` mole of `MnO_(2)`.
B. `2//3` mole of `Mn_(2)O_(7)` and `1//3` mole of `MnO_(2)`.
C. `2//3` mole of `MnO_(4)^(-)` and `1//3` mole of `MnO`.
D. `1//3` mole of `MnO_(4)^(-)` and `2//3` mole of `MnO_(2)`.

Answer

1

Explanation

`3MnO_(4)^(2-)+2H_(2)O rarr2MnO_(4)^(-)+MnO_(2) darr+4OH^(-)`