Which forces are involved in physical adsorption?

For the adsorption of a solution on a solid surface,the Freundlich adsorption isotherm is given by $\frac{x}{m} = k C^{1/n}$. The plot of $\log (\frac{x}{m})$ versus $\log C$ is shown below. This corresponds to which of the following conditions?

Why is $Fe(OH)_3$ colloid positively charged when prepared by adding $FeCl_3$ to hot water?

Which statement is true for Column Chromatography?

According to the Freundlich adsorption isotherm,which of the following is correct?

Adsorption is accompanied by