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Extent of physisorption of a gas increas...

Extent of physisorption of a gas increases with ………. .

A

increase in temperature

B

decrease in temperature

C

decrease in surface area of assorbent

D

decrease in strength of van der Waals' forces

Text Solution

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The correct Answer is:
To solve the question regarding the extent of physisorption of a gas, we need to analyze the factors that influence physisorption. ### Step-by-Step Solution: 1. **Understanding Physisorption**: - Physisorption refers to the physical adsorption of gas molecules on a solid surface. It occurs due to weak Van der Waals forces and does not involve any chemical bonding. 2. **Factors Affecting Physisorption**: - The extent of physisorption is influenced by several factors, including temperature, surface area of the adsorbent, and the strength of Van der Waals forces. 3. **Effect of Temperature**: - Physisorption is an exothermic process, meaning it releases heat. As the temperature decreases, the kinetic energy of gas molecules decreases, allowing more gas molecules to be adsorbed onto the surface. Conversely, increasing the temperature provides more energy to the gas molecules, which can lead to desorption (the gas molecules leaving the surface). 4. **Surface Area of the Adsorbent**: - A larger surface area allows more gas molecules to be adsorbed. Therefore, if the surface area decreases, the extent of physisorption will also decrease. 5. **Strength of Van der Waals Forces**: - The strength of Van der Waals forces plays a crucial role in physisorption. If the strength of these forces decreases, the extent of physisorption will also decrease. 6. **Conclusion**: - Based on the analysis, the extent of physisorption of a gas increases with a decrease in temperature. Thus, the correct answer to the question is that the extent of physisorption increases with a decrease in temperature. ### Final Answer: The extent of physisorption of a gas increases with a decrease in temperature. ---
To solve the question regarding the extent of physisorption of a gas, we need to analyze the factors that influence physisorption. ### Step-by-Step Solution: 1. **Understanding Physisorption**: - Physisorption refers to the physical adsorption of gas molecules on a solid surface. It occurs due to weak Van der Waals forces and does not involve any chemical bonding. 2. **Factors Affecting Physisorption**: ...
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