Which statement(s) is /are correct ?a)Physical adsorption is multilalyer non-directional and non specificb)Chemical adsorption is generally monolayer and specific in naturec)Physical adsorption is due to free valence of atomsd)Chemical adsorption is stronger than physical adsorptionCorrect answer is option 'A,B,D'. Can you explain this answer?

Question

Answer

Chemical adsorption is strong, unilayer, directional and strong.
Chemisorption happens due to specific forces so, it is not reversible generally.
Physical adsorption is weak, multilayer, non-directional and non-specific.
Also, physisorption happens due to weak attraction forces like van,der Waals forces.

Answer

Chemical adsorption is strong, unilayer, directional and strong.
Chemisorption happens due to specific forces so, it is not reversible generally.
Physical adsorption is weak, multilayer, non-directional and non-specific.
Also, physisorption happens due to weak attraction forces like van,der Waals forces.

Answer

Physical adsorption:
Physical adsorption, also known as physisorption, is a process in which molecules are adsorbed onto the surface of a solid through weak van der Waals forces. Some important characteristics of physical adsorption are:

1. Multilayer non-directional:
Physical adsorption occurs in multiple layers, meaning that multiple layers of molecules can be adsorbed onto the surface of the solid. The adsorbed molecules are randomly oriented and have no specific arrangement.

2. Non-specific:
Physical adsorption is non-specific, meaning that it occurs between any solid surface and gas or liquid molecules. There is no selectivity for specific molecules, and any molecule that comes into contact with the surface can be adsorbed.

3. Weak van der Waals forces:
Physical adsorption is driven by weak intermolecular forces such as van der Waals forces. These forces arise from the temporary fluctuations in electron distribution within molecules, resulting in weak attractive forces between the adsorbate and the solid surface.

Chemical adsorption:
Chemical adsorption, also known as chemisorption, is a process in which molecules undergo a chemical reaction with the solid surface and form strong chemical bonds. Some important characteristics of chemical adsorption are:

1. Monolayer and specific:
Chemical adsorption generally occurs as a monolayer, meaning that only one layer of molecules is adsorbed onto the surface. The adsorbed molecules have a specific arrangement and orientation due to the formation of chemical bonds with the solid surface.

2. Specific molecules:
Chemical adsorption is specific, meaning that it occurs between specific molecules and the solid surface. The adsorption process involves the breaking and forming of chemical bonds, resulting in the adsorbate molecules being chemically bound to the solid surface.

3. Strong chemical bonds:
Chemical adsorption involves the formation of strong chemical bonds between the adsorbate and the solid surface. These bonds can be covalent or ionic in nature and are much stronger than the weak van der Waals forces involved in physical adsorption.

Comparing physical and chemical adsorption:
- Physical adsorption is multilayer, non-directional, and non-specific, whereas chemical adsorption is generally monolayer, specific, and involves the formation of strong chemical bonds.
- Physical adsorption is driven by weak van der Waals forces, while chemical adsorption involves the formation of strong chemical bonds.
- Chemical adsorption is generally stronger than physical adsorption due to the stronger chemical bonds involved.

Therefore, the correct statements are:
a) Physical adsorption is multilayer non-directional and non-specific.
b) Chemical adsorption is generally monolayer and specific in nature.
d) Chemical adsorption is stronger than physical adsorption.

Answer

Physical adsorption is due to vander waal force net by free valency.

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