Ncert Exercises & Solutions

Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form dioxides of nitrogen because ______.

1.	The reaction is endothermic and requires very high temperature
2.	The reaction can be initiated only in presence of a catalyst
3.	Oxides of nitrogen are unstable
4.	N₂ and O₂ are unreactive

Major components of atmosphere are dinitrogen, dioxygen and water vapour

N₂=78.08%, O₂=20.95%

Both do not react with each other as nitrogen is an inactive gas. The triple bond in N₂ is very stable and its dissociation energy is very high. Both react with each other at very high temperature.

N_{2} (g) + O_{2} (g) \overset{3000 ° C}{\to} 2 NO (g)

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