Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidifield `KMnO_(4)` for complete oxidation ?

Options

A. `(Fe)C_(2)O_(4)`
B. `Fe(NO_(2))_(2)`
C. `FeSO_(4)`
D. `FeSO_(3)`

Answer

C

Explanation

Because in others, the anion will also be oxidized by `KMnO_(4)`.
`{:(C_(2)O_(4)^(2-)rarrCO_(2),,NO_(2)^(-)rarrNO_(3)^(-)),(SO_(3)^(2-)rarrSO_(4)^(2-),,SO_(4)^(2-)rarr"No oxidation"):}`