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 unreactive

Options

A. the reaction is endothermic and requires very high temperature
B. the reaction can be intiated only in presence of a catalyst
C. oxides of nitrogen are unstable
D. `N_(2) and O_(2)` are unreactive

Answer

A