The gas phase reaction 2 NO 2 g → N 2 O 4 g is an exothermic reaction. The decomposition of N 2 O 4 , in equilibrium mixture of NO 2 g and N 2 O 4 ( g ) can be increased by:

Step-by-step solution

2   NO 2 g →   N 2 O 4   g                         ∆ H = ( - ) ve By addition of inert gas at constant pressure, volume increases and thus, the pressure decreases. The reaction now moves in backward direction as this would increase pressure and hence, decomposition of N 2 O 4 increases.