Question

the rate of diffusion of liquid is higher than that of solid. why?

Answer 1

In the liquid state, particles move freely,the particles are not closely packed they can slip and slide on each other and have greater space between them as, compared to solids.
The intermolecular space is more in liquids than in solids and so, it can difusse faster.That is why rate of difussion in liquids is higher than that of solids.

Answer 2

The rate of diffusion is higher in liquids than in solids because the molecules are loosely packed in liquids than in solids. And also liquids have low density as compared to solids...

Hope it helps u