Which of the following statements is`//`are correct?

Options

A. In the reaction `MnO_(4)^(2-)+H^(o+)rarrMn^(2+)+?`
the missing product is `MnO_(4)^(ө)`.
B. In the above reaction `(a)`, the missing product is `MnO_(2)`.
C. In the reaction `NO_(2)+H_(2)OrarrNO+` ?
the missing product is `NO_(3)^(ө)`.
D. In the above reaction `(c )`, the missing product is i`NO_(2)^(ө)`.

Answer

A, C

Explanation

The `MnO_(4)^(2-)` is reduced to `Mn^(2+)`, so it must also be oxidised to `Mn^(7+) (MnO_(4)^(ө))` since `H^(o+)` is already in its maximum oxidation state.
`5MnO_(4)^(2-)+H_(2)OrarrMn^(2+)+4MnO_(4)^(ө)+4H_(2)O`
c. `NO_(2)` disproportionation to `NO` and `NO_(3)^(ө)`, (Oxidation state of `N is +5`)
`3NO_(2)+H_(2)OrarrNO+2NO_(3)^(ө)+2H^(o+)`