4 KMnO4 + 5 Na2SO3 + 11 H2SO4 → 4 MnSO4 + 10 NaSO4 + 2 K2SO4 + 11 H2O
This is an acid-base reaction (neutralization): Na2SO3 is a base, H2SO4 is an acid.
This is an oxidation-reduction (redox) reaction:
4 MnVII + 20 e- → 4 MnII (reduction)
5 SVI - 5 e- → 5 SVII (oxidation)
5 SIV - 15 e- → 5 SVII (oxidation)
KMnO4 is an oxidizing agent, H2SO4 is a reducing agent, Na2SO3 is a reducing agent.
Warning: Unknown compound 'NaSO4'