If the adsorbate is held on a surface by weak Van der Waals forces,the adsorption process is called:

The graph given below shows the relationship between the extent of adsorption $(x / m)$ and pressure at different temperatures. The correct order of temperatures for curves $i$,$ii$,and $iii$ is:

Which one of the following statements is correct for adsorption of solutes on solids in solutions?

Adsorption is always

Which among the following gases is least adsorbed on a solid at similar conditions of temperature and pressure?

The colloidal sol of $SnCl_4$ prefers the adsorption of which ion in the presence of excess $HCl$?