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Dinitrogen and dioxygen, the main constituents of air do not react with each other in atmosphere to form oxides of nitrogen because

1. N 2 is unreactive in the condition of atmosphere
2. Oxides of nitrogen are unstable
3. Reaction between them can occur in the presence of a catalyst
4. The reaction is endothermic and require very high temperature

Correct answer: The reaction is endothermic and require very high temperature

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