Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form oxides of nitrogen because _________.
(i) the reaction is endothermic and requires very high temperature.
(ii) the reaction can be initiated only in presence of a catalyst.
(iii) oxides of nitrogen are unstable.
(iv) N_{2} and O_{2} are unreactive.

Answers (1)

The answer is the option (i) the reaction is endothermic, and it requires a very high temperature.

Explanation: The dissociation energy of N_{2} is very high due to the presence of a triple bond, and it is very stable; therefore, these gases do not react with each other at room temperature.

 

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