2 NH4ClO4 (aq) → N2 (g) + Cl2 (g) + 2 O2 (g) + 4 H2O (l)
This is an oxidation-reduction (redox) reaction:
2 Cl-I - 2 e- → 2 Cl0 (oxidation)
2 NV + 10 e- → 2 N0 (reduction)
4 O-II - 8 e- → 4 O0 (oxidation)
NH4ClO4 is a reducing agent, NH4ClO4 is an oxidizing agent, NH4ClO4 is a reducing agent.
This is a gas evolution reaction, N2 and Cl2 and O2 is the formed gas.