Question:
The phenomenon in which the adsorbate molecules are held on the surface of the adsorbent by a weak van der Waals force of attraction is known as
The phenomenon in which the adsorbate molecules are held on the surface of the adsorbent by a weak van der Waals force of attraction is known as
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Adsorption through weak van der Waals forces without any chemical bond is called physical adsorption.
Updated On: Nov 12, 2026
- physisorption
- chemisorption
- absorption
- desorption
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Adsorption is the sticking of molecules on a surface. It is of two types, depending on the forces holding the adsorbate.
Step 2: Identify the type
When weak van der Waals forces hold the adsorbate, no chemical bond forms. The enthalpy of adsorption is low and the process is reversible.
Step 3: Compare the options
Chemisorption involves chemical bonds, absorption is uptake into the bulk, and desorption is removal of the adsorbate.
Final Answer:
The phenomenon is called physisorption. \[ \boxed{\text{(A) }\text{physisorption}} \]
Adsorption is the sticking of molecules on a surface. It is of two types, depending on the forces holding the adsorbate.
Step 2: Identify the type
When weak van der Waals forces hold the adsorbate, no chemical bond forms. The enthalpy of adsorption is low and the process is reversible.
Step 3: Compare the options
Chemisorption involves chemical bonds, absorption is uptake into the bulk, and desorption is removal of the adsorbate.
Final Answer:
The phenomenon is called physisorption. \[ \boxed{\text{(A) }\text{physisorption}} \]
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