2 KMnO4 + 10 FeSO4 + 8 H2SO4 → 2 Mn(SO4) + K2(SO4) + 5 Fe2(SO4)3 + 8 H2O
This is an oxidation-reduction (redox) reaction:
2 MnVII + 10 e- → 2 MnII (reduction)
10 FeII - 10 e- → 10 FeIII (oxidation)
KMnO4 is an oxidizing agent, FeSO4 is a reducing agent.