Question

physical significance of vanderwaals constants a and b

Answer 1

The van der Waals equation is an equation of state for a fluid composed of particles that have a non-zero volume and a pairwise attractive inter-particle force 

Answer 2

Physical significance of ‘a’: ‘a’ is a measure of the magnitude of intermolecular attractive forces between the particles

Physical significance of ‘b’:

‘b’ is the volume excluded by a mole of particles