In which of the following reactions H2O2 acts as a reducing agent? (1) H2O2+2H++2e−→2H2O(2) H2O2−2e−→O2+2H+(3) H2O2+2e−→2HO−(4) H2O2+2OH−−2e−→O2+2H2O

The reducing agent oxidises itself by undergoing oxidation through the loss of electrons. Thus, reducing agent reduces other molecules by supplying electrons to them. (1) H2O2−1+2H++2e−→2H2O−2In this reaction, H2O2 undergoes reduction as O shows increase in oxidation number. (2) H2O2−1−2e−→O2o+2H+In the reaction, H2O2 undergoes oxidation as it shows O shows increase in oxidation number. Thus, H2O2 acts as a reducing agent. (3) H2O2−1−2e−→2O-2H−In this reaction, H2O2 undergoes reduction. (4) H2O2−1+2OH−−2e−→O20+2H2OIn this reaction, H2O2 undergoes oxidation. Thus, acts as a reducing agent.