2 KMnO4 (aq) + 5 HOOCCOOH (aq) + 3 H2SO4 (aq) → K2SO4 (aq) + 2 MnSO4 (aq) + 8 H2O (l) + 10 CO2 (g)
This is an oxidation-reduction (redox) reaction:
2 MnVII + 10 e- → 2 MnII (reduction)
10 CIII - 10 e- → 10 CIV (oxidation)
This is a gas evolution reaction, CO2 is the formed gas.