# The process of adsorption of hydrogen on palladium is known as

$\begin{array}{1 1}(a)\;\text{Syneresis}\\(b)\;\text{Occlusion}\\(c)\;\text{Diffusion}\\(d)\;\text{Erosion}\end{array}$

Adsorption of gas on the surface of solid is also known as occlusion.
Hence (b) is the correct answer.