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# Dinitrogen and dioxygen are main

Question:

Dinitrogen and dioxygen are main constituents of air but these do not react

with each other to form oxides of nitrogen because of _________.

(i) the reaction is endothermic and requires very high temperature.

(ii) the reaction can be initiated only in the presence of a catalyst.

(iii) oxides of nitrogen are unstable.

(iv) N2and O2 are unreactive.

Solution:

Option (i) the reaction is endothermic and requires very high temperature is the answer.