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:

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Correct answer: A. Addition of an inert gas at constant pressure

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.

The gas phase reaction 2 NO _ 2 (g) → N _ 2 O _ 4 (g) is an...

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