Question

N2 gas + o2 gas give rise to 2nogas how it is enothermic reaction

Answer 1

When N2 and O2 reacts they need heat from the surrounding i.e. N2 and O2 reacts only in presence of heat. Hence, heat is absorbed during formation of NO by N2 and O2

Defination of endothermic reaction:

When heat is absorbed during the reaction , the reaction is called endothermic reaction.

Hence,

N2 + O2 ---------> 2NO

is an endothermic reaction.