Question

Write the differences between Physisorption And Chemisorption.

Answer 1

Differences between physisorption and chemisorption:

Physisorption	Chemisorption
It is also referred to as physical adsorption.	It is sometimes referred to as chemical adsorption.
Van der Waals forces are responsible for physisorption.	Chemisorption is caused by chemical bonding.
In nature, physical adsorption is reversible.	In nature, chemical adsorption is irreversible.
It is not specific in nature.	It is very specific in nature.
The adsorption enthalpy of physisorption is quite low, ranging from roughly $20\mathrm{to}40{\mathrm{kJmol}}^{-1}$.	Chemisorption has a larger adsorption enthalpy, roughly $80\mathrm{to}240{\mathrm{kJmol}}^{-1}$.
It preferentially occurs at low temperatures.	It occurs more frequently in high temperatures.
The degree of physisorption that occurs reduces as the temperature rises.	The degree of chemisorption that occurs increases as the temperature rises.
Because of the weak Van Der Waal forces, physisorption produces a multimolecular layer.	Because chemisorption is created by covalent bonds, which are extremely strong bonds, it results in a unimolecular layer.
The activation energy of physical adsorption is lower.	The activation energy of chemical adsorption is large.