Which of the following is not the characteristic of physisorption?
Which of the following is not the characteristic of physisorption?
It arises because of vander Waals forces.
It is not specific in nature.
Enthalpy of adsorption is high.
It results into multi molecular layers on adsorbent surface under high pressure.
The Correct Option is C
Solution and Explanation
The characteristic of physisorption that is not correct is:
Enthalpy of adsorption is high.
Physisorption is characterized by weak van der Waals forces between the adsorbent and the adsorbate. As a result, the enthalpy of adsorption in physisorption is relatively low. The other options are correct:
- Physisorption arises because of van der Waals forces.
- Physisorption is not specific in nature.
- Physisorption can result in the formation of multi-molecular layers on the adsorbent surface under high pressure.
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Concepts Used:
Surface Chemistry
The study of the chemical phenomena that occur at the interface of two surfaces which can be solid-liquid, solid-gas, solid-vacuum, liquid-gas, etc.
Read Also: Surface Chemistry
Applications of surface chemistry are:
Adsorption:
The process of attraction and aggregation of the molecules of a substance on the surface of a solid is known as adsorption. For Example, N2 adsorbs on the surface of activated charcoal
Two types of adsorption are:-
- Chemisorption: It is also known as Chemical Adsorption.
- Physisorption: It is also known as Physical Adsorption.
Corrosion:
The process through which the refined metals convert themselves into more stable compounds is known as corrosion.
Crystallisation:
The type of technique used in order to purify the substances to separate Solids from liquids is known as crystallisation.
Heterogeneous Catalysis:
The process wherein a catalyst is used in order to increase the rate of a chemical reaction is known as catalysis. The catalyst does not undergo any transformation and can be recovered in a chemically unchanged state.
There are two types of catalysis:-
- When the catalyst involved and the reacting substances are same states of matter or in the same phase, it is known as Homogeneous Catalysis.
- When the catalyst involved and the reacting substances are in different states of matter or different phases, it is known as Heterogeneous Catalysis.