2 KMnO4 (aq) + 6 FeSO4 (aq) + 3 K2SO4 (aq) + 4 H2O (l) → 2 MnO2 (s) + 3 Fe2(SO4)3 (s) + 8 KOH (aq)
This is an oxidation-reduction (redox) reaction:
2 MnVII + 6 e- → 2 MnIV (reduction)
6 FeII - 6 e- → 6 FeIII (oxidation)
KMnO4 is an oxidizing agent, FeSO4 is a reducing agent.