Question

what is latent heat of diffusion and latent heat of evaporation​

Answer 1

In the case of the latent heat of fusion it is the heat required to change a substance from a solid (ice) to a liquid (water) or vice versa while the latent heat of vaporization from a liquid (water) to a gas (steam) or vice versa.

Answer 2

Latent heat of fusion the amount of heat required to convert one kg of solid into liquid without changing temperature .
latent heat of vaporization the amount of heat required to convert one kg of liquid into vapours without changing temperature .