The value of Van der Waal’s constant ‘a’ for the gases O2, N2, NH3 and CH4 are 1.360, 1.390, 4.170 and 2.253L2 atm mol–2 respectively. The gas which can most easily be liquified is

The importance of the Van der Waal’s constant a and b is- The constant ‘a’ gives the measure of intermolecular forces of attraction. Gaseous State 21 The constant b gives the measure of molecular size. Critical temperature is the temperature at and above which vapor of the substance cannot be liquified, no matter how much pressure is applied. It is the parameter that tells about the Van der Waal force of attraction. Higher the Van der Waal force of attraction, higher will be its critical temperature and it would be easy to liquefy the gas. Out of given gases, ammonia has higher value of consta