In the formation of ${\mathrm{NO}}_2$ by the reaction $2{\mathrm{NO}}_{\left(\mathrm{g}\right)}+{\mathrm{O}}_{2\left(\mathrm{g}\right)}\to {\mathrm{NO}}_{2\left(\mathrm{g}\right)}+$is favored by

The chemical reaction to the formation of ${\mathrm{NO}}_2$is given below.

$2{\mathrm{NO}}_{\left(\mathrm{g}\right)}+{\mathrm{O}}_{2\left(\mathrm{g}\right)}\to {\mathrm{NO}}_{2\left(\mathrm{g}\right)}+$ heat

In the above reaction volume is decreased in a forward direction. Thus high pressure favors the forward reaction. In the given reaction heat is released so it is an exothermic reaction. Therefore, the reaction favored at low temperature. But at very low temperature the forward reaction is very slow. To carry on the reaction in a forward direction optimum temperature must required.