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Adsorption involves multimolecular layer...

Adsorption involves multimolecular layers in the case of:

A

Physical adsorption

B

Chemisorption

C

Both (1) and (2)

D

None of these

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The correct Answer is:
To solve the question "Adsorption involves multimolecular layers in the case of:", we need to understand the concepts of adsorption and the types of adsorption. Here’s a step-by-step solution: ### Step 1: Understand the Concept of Adsorption Adsorption is the process by which atoms, ions, or molecules from a gas, liquid, or dissolved solid adhere to a surface. This is different from absorption, where a substance is taken up into the bulk of another substance. **Hint:** Remember that adsorption refers to the accumulation of particles on a surface, while absorption involves the penetration of particles into the bulk. ### Step 2: Differentiate Between Types of Adsorption There are two main types of adsorption: 1. **Physical Adsorption (Physisorption)**: This involves weak van der Waals forces. It is generally reversible and can result in the formation of multiple layers of adsorbate on the adsorbent surface. 2. **Chemical Adsorption (Chemisorption)**: This involves the formation of strong chemical bonds between the adsorbate and the adsorbent. It is usually irreversible and typically results in the formation of a monolayer. **Hint:** Focus on the strength of the interactions involved in each type of adsorption. Physisorption allows for multiple layers, while chemisorption usually leads to a single layer. ### Step 3: Analyze the Formation of Multimolecular Layers In physical adsorption, since the forces are weak, adsorbate molecules can easily accumulate on top of each other, leading to the formation of multimolecular layers. In contrast, in chemical adsorption, once the surface is saturated with adsorbate, additional molecules cannot adhere because they cannot form strong bonds without the presence of available active sites. **Hint:** Think about how the nature of the bonds affects the ability of additional layers to form. ### Step 4: Conclusion Based on the above analysis, we conclude that adsorption involving multimolecular layers occurs in the case of **physical adsorption (physisorption)**. ### Final Answer: Adsorption involves multimolecular layers in the case of **physical adsorption**. ---
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