Which type of bond is involved in the phenomenon of physical adsorption?

According to the Langmuir adsorption isotherm,at high pressure,the amount of gas adsorbed is .......

Which of the following statements is true regarding chemisorption?

In Freundlich adsorption isotherm at moderate pressure,the extent of adsorption $\left(\frac{x}{m}\right)$ is directly proportional to $P^x$. The value of $x$ is

The correct option$(s)$ related to adsorption processes is(are):
$A$. Chemisorption results in a unimolecular layer.
$B$. The enthalpy change during physisorption is in the range of $100$ to $140 \ kJ \ mol^{-1}$.
$C$. Chemisorption is an endothermic process.
$D$. Lowering the temperature favors physisorption processes.

What is the type of phenomenon involved in the removal of coloring matter from a sugar solution using charcoal?