In the reaction $N_2\left(g\right)+ O_2\left(g\right)\rightleftharpoons 2NO\left(g\right)$.

∆H=180 kJ. On increasing the temperature, the production of NO

 $N_2\left(g\right)+ O_2\left(g\right)\rightleftharpoons 2NO\left(g\right)$

∆H=180 kJ, for this reaction ∆H is positive, indicating that the process is endothermic. Le-principal Chatelier states that when an endothermic reaction occurs, a rise in temperature causes the reaction to move toward the product side. Therefore, as the temperature rises, more NO is produced.

Therefore, the correct answer is option (A) Increases.