question_answer 1)

  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

Answer:

  (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.                                 \[{{N}_{2}}+{{O}_{2}}\xrightarrow{3000{{\,}^{{}^\circ }}C}2NO\]