SnSO4 (aq) + H2O2 (aq) → Sn (s) + H2SO4 (aq) + O2 (g)
This is an oxidation-reduction (redox) reaction:
SnII + 2 e- → Sn0 (reduction)
2 O-I - 2 e- → 2 O0 (oxidation)
SnSO4 is an oxidizing agent, H2O2 is a reducing agent.
This is a precipitation reaction: Sn is the formed precipitate.
This is a gas evolution reaction, O2 is the formed gas.