In the reaction,
H2S + H2O2 → S + 2H2O
H2S is an acid and H2O2 is a base
H2S is a base and H2O2 is an acid
H2S is an oxidizing agent and H2O2 is a reducing agent
H2S is a reducing agent and H2O2 is an oxidising agent
Oxidation
H2S-2 Reducing agent+ H2O-12Oxidising agent →Reduction S0 + 2H2O-2