According to Freundlich adsorption isotherm, the amount of gas adsorbed at very high pressure
- reaches a constant limiting value
- goes on increasing with pressure
- goes on decreasing with pressure
- increases first and decreases later with pressure
The Correct Option is A
Approach Solution - 1
The correct Answer is option (A) : reaches a constant limiting value
Approach Solution -2
The correct option is (A)
As per Langmuir Adsorption isotherm, the amount of gas adsorbed at very high pressures reaches a constant limiting value. The amount of gas adsorbed will not rise with the further rise in pressure.
Approach Solution -3
Adsorption is a phenomenon that involves attracting and retaining the molecules of substance at the surface of a liquid or a solid resulting in a higher concentration of molecules at the surface. The substance thus adsorbed on the surface is known as adsorbate and on which it is adsorbed is called adsorbent.
Complete step-by-step answer:
The adsorption process that takes place at a constant temperature but the pressure varies is called adsorption isotherm. It is of two types –
- Langmuir adsorption isotherm
- Freundlich’s adsorption isotherm
The Langmuir adsorption isotherm (LAI) is used to describe the equilibrium between the adsorbate and adsorbent system in which the adsorbate adsorption is limited to one molecular layer at or before a relative pressure of unity is reached.
Hence, the correct option is (A).
Note: The process of adsorption depends on the nature of the gas, temperature, pressure, and surface area of the adsorbent. The effect of pressure isotherm is explained in the process of adsorption. After reaching the saturation value, pressure does not play the same role. When the surface area of the adsorbent is covered fully, the process goes stops but there is a dynamic equilibrium between adsorption and desorption. Into an immobile state, it adsorbs an adsorbing gas. Each site can hold at most one molecule of monolayer coverage only, no interaction between adsorbate molecules on adjacent sites.
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Concepts Used:
Adsorption
Heinrich Kayser, the German physicist was the first to coin the term adsorption. Adsorption can be explained as a surface phenomenon where particles remain attached on the top of a material. Generally, it comprises the molecules, atoms, liquid, solid in a dissolved stage, even the ions of a gas that are attached to the surface. Much to our surprise, the consequence of surface energy i.e. adsorption is present in biological, physical, chemical, and natural systems and are used in many industrial applications.
