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In the following question, A statement o...

In the following question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.
Reason (R): It is due to decrease in strength of van der Waals forces.

A

Both A and Rare true and R is the correct explanation of A

B

Both A and R are true but R is not the correct explanation of A

C

A is true but R is false

D

A is false and R is True

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the Assertion (A) and the Reason (R) given in the problem. ### Step 1: Analyze the Assertion (A) **Assertion (A):** "Extent of physisorption of a gas increases with decrease in temperature." - **Explanation:** Physisorption involves the adsorption of gas molecules onto a surface due to weak van der Waals forces. These forces are influenced by temperature. As the temperature decreases, the kinetic energy of gas molecules decreases, allowing them to be more easily attracted to the surface due to increased van der Waals forces. Therefore, the extent of physisorption indeed increases with a decrease in temperature. ### Step 2: Analyze the Reason (R) **Reason (R):** "It is due to decrease in strength of van der Waals forces." - **Explanation:** This statement is incorrect. As mentioned earlier, when the temperature decreases, the strength of van der Waals forces actually increases, not decreases. Therefore, the reason provided does not correctly explain the assertion. ### Conclusion - **Assertion (A) is true.** - **Reason (R) is false.** ### Final Answer The correct choice is: **Option 3: A is true but R is false.** ---
To solve the question, we need to analyze both the Assertion (A) and the Reason (R) given in the problem. ### Step 1: Analyze the Assertion (A) **Assertion (A):** "Extent of physisorption of a gas increases with decrease in temperature." - **Explanation:** Physisorption involves the adsorption of gas molecules onto a surface due to weak van der Waals forces. These forces are influenced by temperature. As the temperature decreases, the kinetic energy of gas molecules decreases, allowing them to be more easily attracted to the surface due to increased van der Waals forces. Therefore, the extent of physisorption indeed increases with a decrease in temperature. ### Step 2: Analyze the Reason (R) ...
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