In the environment, 78% of dinitrogen gas and 21% of dioxygen gas is present still cannot react because the reaction is endothermic and requires very high temperature. Nitrogen oxide is formed at a very high temperature.
(ii) The catalyst lowers the energy of formation. Here only in the presence of a catalyst, the reaction cannot be initiated.
(iii) Oxides of nitrogen like NO2 is resonance stabilized and some others are relatively unstable.
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