Physical Chemistry - Surface Chemistry

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Q1. What is the significance of the Langmuir isotherm in surface chemistry? (2023)

Solution:

The Langmuir isotherm assumes a fixed number of adsorption sites and describes monolayer adsorption on a surface.

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Q2. In the context of adsorption, what does the term 'selectivity' refer to? (2022)

Solution:

Selectivity in adsorption refers to the preference of an adsorbent for one gas over another, which can be crucial in separation processes.

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Q3. What is the term used for the process of removing adsorbed molecules from a surface? (2020)

Solution:

Desorption is the process of removing adsorbed molecules from a surface, while adsorption is the process of molecules adhering to a surface.

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Q4. In the context of surface chemistry, what does the term 'desorption' refer to? (2022)

Solution:

Desorption refers to the process by which an adsorbate is released from the surface of the adsorbent.

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Q5. What is the term for the maximum amount of adsorbate that can be adsorbed on a unit mass of adsorbent? (2020)

Solution:

The maximum amount of adsorbate that can be adsorbed on a unit mass of adsorbent is referred to as the adsorption capacity.

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Q6. Which of the following is NOT a method for measuring surface area of adsorbents? (2022)

Solution:

Thermogravimetric analysis (TGA) is not a method for measuring surface area; it is used to study thermal stability and composition.

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Q7. In the context of surface chemistry, what does the term 'surface area' refer to? (2020)

Solution:

In surface chemistry, 'surface area' refers to the area available for adsorption, which is crucial for determining the adsorption capacity.

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Q8. Which of the following is true about the adsorption of gases on solids? (2023)

Solution:

The adsorption of gases on solids is typically an exothermic process, as energy is released when the gas molecules adhere to the surface.

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Q9. In the context of surface chemistry, what does the term 'desorption' mean? (2023)

Solution:

Desorption refers to the process where adsorbed molecules are released from the surface back into the gas or liquid phase.

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Q10. Which of the following is a common method to measure surface area of adsorbents? (2019)

Solution:

The BET method (Brunauer-Emmett-Teller) is commonly used to measure the surface area of adsorbents.