Substances that are oxidized and reduced in the following reaction are respectively N2H4(l) + 2 H2O2(l)→N2(g) +4 H2O(l)

Oxidation state of 'N' in N2H4 increased from -2 to zeroN2H4  OxidizedOxidation state of 'O' in H2O2 decreased from -1 to -2H2O2  reduced