Assertion: Compressibility factor (Z) for non- ideal gases may be less than or greater than 1. Reason: Non-ideal gases always exert higher pressure than expected.

Van der Waal equation for real gases is given as- 2 2 ( )(V nb) nRT an P V Gaseous State 40 where 2 2 an V is the correction factor for intermolecular force of attraction and nb is volume of gas molecules.