The correct option is B N2(g)+O2(g)⇌2NO(g)−43200cal
Option (B) is correct.
Endothermic reactions are favoured with the increase in temperature. In an endothermic reaction, an increase in temperature favours the reaction to occur in the forward direction. It means heat is absorbed by the reactants. When the temperature of an equilibrium mixture is increased, the rate of both reactions increases but the rate of the endothermic reaction (the reaction that absorbs the added energy) is increased more.