2 K2CrO4 + 3 H2O2 + 5 H2SO4 → Cr2(SO4)3 + 8 H2O + 2 K2SO4 + 3 O2
This is an acid-base reaction (neutralization): K2CrO4 is a base, H2SO4 is an acid.
This is an oxidation-reduction (redox) reaction:
2 CrVI + 6 e- → 2 CrIII (reduction)
6 O-I - 6 e- → 6 O0 (oxidation)
K2CrO4 is an oxidizing agent, H2O2 is a reducing agent.