In dilute aqueous `H_(2)SO_(4)` the complete diaquadioxalatoferrate (II) is oxidised by `MnO_(4)^(-)`. For the reaction, the ratio of the rate of change of `[H^(+)]` to the rate of change of `[MnO_(4)^(-)]` is

Answer

8

Explanation

The given complex, `[Fe(C_(2)O_(4))(H_(2)O)_(2)]^(2-)` contains
Fe in +2 oxidation state. In acidic medium, `KMnO_(4)` oxidizes `Fe^(2+)` to `Fe^(3+)`
`MnO_(4)^(-)+8H^(+)+5Fe^(2+)rarrMn^(2+)+4H_(2)O+5Fe^(3+)`
`5Fe^(2+)-=5[Fe(C_(2)O_(4))_(2)(H_(2)O)_(2)]^(2-)`
`therefore ("Rate of change of "[H^(+)])/("Rate of change of "[MnO_(4)^(-)])=(8)/(1)=8`