7 H2O2 + 2 KMnO4 + 3 H2SO4 → K2SO2 + 2 MnSO4 + 7 O2 + 10 H2O
This is an oxidation-reduction (redox) reaction:
2 MnVII + 10 e- → 2 MnII (reduction)
SVI + 4 e- → SII (reduction)
14 O-I - 14 e- → 14 O0 (oxidation)
KMnO4 is an oxidizing agent, H2SO4 is an oxidizing agent, H2O2 is a reducing agent.