Which compound is oxidized by `KMnO_4` in presence of acid in the following reaction?
`2KMnO_4+10FeSO_4+8H_2SO_4 rarr K_2SO_4+2MnSO_4+5Fe_2(SO_4)_3+8H_2O`

Explanation

In the above reaction, `FeSO_4` is converted into `Fe_2(SO_4)_3` .Therefore, `Fe^(2+)` ion in `FeSO_4` is converted to `Fe^(3+)` ion is `Fe_2(SO_4)_3.` The positive charge on `Fe^(2+)` ion is incresed by one unit.This indicates an oxidation reaction. Hence `FeSO_4` is oxidized by `KMnO_4` in presence of acid.