Question

A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversile. Identify the correct statement that describes the above adsorption process:(a) Adsorption is monolayer. (b) Adsorption increases with increase in temperature. (c) Enthalpy of adsorption is greater than $100 \mathrm{~kJ} \mathrm{~mol}^{-1}$ (d) Energy of activation is low.

Name: Problem 9, Chapter 19: 43 Years JEE ADVANCED (1978-2020) + JEE MAIN Chapterwise & Topicwise Solved Papers Chemistry
Uploaded: 2021-10-23T06:19:41-08:00
Duration: 2 min
Channel: Nikhil Choudhary
Description: A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversile. Identify the correct statement that describes the above adsorption process:(a) Adsorption is monolayer. (b) Adsorption increases with increase in temperature. (c) Enthalpy of adsorption is greater than 100 kJ mol^-1 (d) Energy of activation is low.

   A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversile. Identify the correct statement that describes the above adsorption process:(a) Adsorption is monolayer.
(b) Adsorption increases with increase in temperature.
(c) Enthalpy of adsorption is greater than $100 \mathrm{~kJ} \mathrm{~mol}^{-1}$
(d) Energy of activation is low.

43 Years JEE ADVANCED (1978-2020) + JEE MAIN Chapterwise & Topicwise Solved Papers Chemistry

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Chapter 19, Problem 9

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Solved by Expert Nikhil Choudhary

10/23/2021

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This indicates that the process is physical adsorption, also known as physisorption. Show more…

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A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversile. Identify the correct statement that describes the above adsorption process:(a) Adsorption is monolayer. (b) Adsorption increases with increase in temperature. (c) Enthalpy of adsorption is greater than $100 \mathrm{~kJ} \mathrm{~mol}^{-1}$ (d) Energy of activation is low.

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Key Concepts

Physisorption

Physisorption is a type of adsorption where the adsorbate adheres to the surface of the adsorbent via weak van der Waals forces. This process is typically characterized by reversible adsorption, low enthalpy changes, and the ability to occur in multilayer forms, making it fundamentally different from chemisorption which involves stronger chemical bonds.

Van der Waals Forces

Van der Waals forces are weak intermolecular attractions that occur between molecules. In the context of adsorption, these forces are responsible for binding the adsorbate to the surface during physisorption, leading to low activation energy and reversible behavior.

Activation Energy in Adsorption

Activation energy in adsorption refers to the minimum energy barrier that must be overcome for adsorption to occur. In physisorption, the activation energy is low because of the weak van der Waals interactions, which facilitates reversible adsorption processes.

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