Which of the following is incorrect regarding Langmuir adsoroption isothem?

Options

A. Langmuir desived an adsorption isotherm on theoretical consideration based on kinetic theory of gases.
B. Langmuir isotherm is based on the assumption that every adsorption site is equivalent and that the ability of a particle to bind there is independent of whether or not nearby sites are occupied.
C. Langmuir considered adsorption to consist of the two opposing processes.
D. The Langmuir isotherm is generally more successful in interpreting the data than the Freundlich isotherm when a multilayer is formed.

Answer

D

Explanation

Langmuir assumed that the layer of the adsorbed gas was only one molecule thick i.e. unimolecular. Since such type of adsorption is obtained in the case of chemisorption. Langmuir adsorption isotherm works particularly well for chemisorption.
The two opposing processes considered by Langmuir are
(a) Adsorption of the gases molecules on the surface of the solid
(b) Desorption of the adsorbed molecules from the surface of the solid.
Langmuir believed that eventually a dynamic equilibrium is established between the above two opposing processes.