Question

Which among the following statements is false?
A) The adsorption may be monolayered or multilayered
B) Particle size of adsorbent will not affect the amount of adsorption
C) Increase of pressure increases amount of adsorption
D) All of the above

Answer 1

Hint: To solve this question, we must first understand the concept of Adsorption. Then we need to assess the important points in Adsorption and then verify all the given options one by one with the properties and then only we can conclude the correct answer.

Complete step by step answer:
Before we move forward with the solution of this given question, let us first understand some basic concepts:
Adsorption: is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. This process creates a film of the adsorbate on the surface of the adsorbent. Adsorption is a surface phenomenon, while absorption involves the whole volume of the material, although adsorption does often precede absorption.
For the adsorption process, two components are required:
Adsorbate: Substance which is deposited on the surface of another substance. For example, ${H_2}$ , ${N_2}$ and ${O_2}$ gases.
Adsorbent: Surface of a substance on which adsorbate adsorbs. For example, Charcoal, Silica gel, Alumina.
Step 1: Yes, it is true that adsorption may be monolayered or multilayered.
Step 2: When we increase the surface area of the adsorbent there is an increase in the adsorption of gases. This is because when we increase the surface area there are more adsorbing sites. Therefore, particle size of adsorbent will affect the amount of adsorption. And Hence Option B is false.
Step 3: Initially when the pressure has increased the rate of adsorption increases due to an increase in the gas molecules striking on the surface. Thus, an increase in the pressure increases the rate of adsorption linearly.
So, clearly we can conclude that the correct answer is Option B.

Note:Similar to surface tension, adsorption is a consequence of surface energy. In a bulk material, all the bonding requirements of the constituent atoms of the material are filled by other atoms in the material. However, atoms on the surface of the adsorbent are not wholly surrounded by other adsorbent atoms and therefore can attract adsorbates.