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If the adsorbate is held on a surface by...

If the adsorbate is held on a surface by weak Vander Waal’s force, the adsorption process is called:

A

Physical adsorption

B

Chemical adsorption

C

Heat of adsorption

D

Enthalpy of adsorption

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The correct Answer is:
To solve the question, we need to understand the concept of adsorption and the types of forces involved in the adsorption process. ### Step-by-Step Solution: 1. **Understand the Terms**: - **Adsorbate**: The substance that is being adsorbed onto a surface. - **Adsorbent**: The surface onto which the adsorbate is adsorbed. - **Adsorption**: The process by which atoms, ions, or molecules from a gas, liquid, or dissolved solid adhere to a surface. 2. **Identify the Forces**: - Adsorption can occur through different types of forces. The question specifies "weak Van der Waals forces." These are relatively weak intermolecular forces that include dipole-dipole interactions, dipole-induced dipole interactions, and London dispersion forces. 3. **Types of Adsorption**: - **Physical Adsorption (Physisorption)**: This type of adsorption occurs when the adsorbate is held to the surface by weak Van der Waals forces. It is generally reversible and involves lower energy changes. - **Chemical Adsorption (Chemisorption)**: This involves the formation of strong chemical bonds between the adsorbate and the adsorbent, leading to a more permanent attachment. 4. **Evaluate the Options**: - **Option 1: Physical Adsorption**: Correct, as it involves weak Van der Waals forces. - **Option 2: Chemical Adsorption**: Incorrect, as it involves stronger chemical bonds. - **Option 3: Heat of Adsorption**: Incorrect, as this term refers to the energy change during adsorption, not a type of adsorption. - **Option 4: Enthalpy of Adsorption**: Incorrect, as this term also refers to the energy associated with the adsorption process. 5. **Conclusion**: The correct answer is **Physical Adsorption** since it is characterized by the adsorption of molecules onto a surface through weak Van der Waals forces. ### Final Answer: If the adsorbate is held on a surface by weak Van der Waals forces, the adsorption process is called **Physical Adsorption**.
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