Is it necessary that all oxidation reactions are exothermic? If ues then why the reaction for formation of nitrogen oxide an endothermic reaction?

N²+ O²+ heat ----> NO

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Solution

Oxidation of hydrocarbon is always exothermic because the reduction of O2 in this case release a lot of energy.Forming CO2 and Water is an extremely exothermic process due to the obvious stability of the two compounds. However, oxidation of many compounds can be endothermic.
The triple bond between two N atoms in N2 is very strong due to small size and thus has a high dissociation energy(Dissociation energy is the energy required to break a single bond).Due to this large amount of energy required to break this bond and thus the oxidation of N2 to form NO is endothermic.

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