Write down the reaction equation H2-NH3-HO-HO2-HNO3

This chain of transformations corresponds to the sequence of reactions used in the production of nitric acid. All reactions of this chain are redox, since the oxidation state of nitrogen is constantly changing: 0 – (-3) – (+2) – (+4) – (+5).
1.3 H2 + N2 = 2 NH3 (ammonia, N- oxidizer)
2.4 NH3 + 5 O2 = 4 NO + 6 H2O (nitrogen oxide 2 and water, N is a reducing agent)
3.2 NO + O2 = 2 NO2 (nitrogen oxide 4, N is a reducing agent)
4.4 NO2 +2 H2O + O2 = 4 HNO3 (nitric acid, N – reducing agent)