2 AuCl3 (aq) + 3 H2O2 (aq) + 6 NaOH (aq) → 3 O2 (g) + 2 Au (s) + 6 NaCl (aq) + 6 H2O (l)
This is an oxidation-reduction (redox) reaction:
2 AuIII + 6 e- → 2 Au0 (reduction)
6 O-I - 6 e- → 6 O0 (oxidation)
AuCl3 is an oxidizing agent, H2O2 is a reducing agent.
This is a precipitation reaction: Au is the formed precipitate.
This is a gas evolution reaction, O2 is the formed gas.