• # question_answer 29)   Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form oxides of nitrogen because : (a) the reaction is endothermic and requires very high temperature (b) the reaction can be initiated only in presence of a catalyst (c) oxides of nitrogen are unstable (d) ${{N}_{2}}$and${{O}_{2}}$ are un reactive

(a) Major components of atmosphere are dinitrogen, dioxygen and water vapour.   ${{N}_{2}}78.0%,\,\,\,\,\,{{O}_{2}}-20.95%$ Both do not react with each other as nitrogen is an inactive gas. The triple bond in ${{N}_{2}}$is very stable and its dissociation energy is very high (225 kcal/mol). Both react with each other at very high temperature.                                 ${{N}_{2}}+{{O}_{2}}\xrightarrow{3000{{\,}^{{}^\circ }}C}2NO$

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