A quantity of 25.0 mL of solution containing both `Fe^(2+)` and `Fe^(3+)` ions is titrated with 25.0 mL of 0.0200 `M KMnO_(4)` (in dilute `H_(2)SO_(4)`). As a result, all of the `Fe^(2+)` ions are oxidised to `Fe^(3+)` ions.
Next 25 mL of the original solution is treated with Zn metal finally, the solution requires 40.0 mL of the same `KMnO_(4)` solution for oxidation to `Fe^(3+)`.
`MnO_(4)^(-)+5Fe^(2+)+8H^(+)toMn^(2+)+5Fe^(3+)+4H_(2)O`
Zinc aded in the second titration wil

Options

A. 25mL, 40mL
B. 25mL, 15mL
C. 20.8 mL 33.3 mL
D. 10.4 mL , 16.7 mL

Answer

C