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the heat evolved in physisorption lies i...

the heat evolved in physisorption lies in the range (in kJ/mol) of :

A

20 - 40

B

40- 100

C

100 - 200

D

200 - 400

Text Solution

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The correct Answer is:
To solve the question regarding the heat evolved in physisorption, we will follow these steps: ### Step 1: Understand Physisorption Physisorption is a type of adsorption where the molecules of the adsorbate are held to the surface of the adsorbent by weak Van der Waals forces. This interaction is relatively weak compared to chemisorption, where stronger chemical bonds are formed. **Hint:** Remember that physisorption involves weak forces, which leads to lower energy changes compared to chemisorption. ### Step 2: Identify the Characteristics of Physisorption Physisorption has several characteristics: - It is generally reversible. - The heat of adsorption (or heat evolved during the process) is low. - It does not depend significantly on the nature of the adsorbent or adsorbate. **Hint:** Focus on the reversibility and weak interactions, as these are key characteristics of physisorption. ### Step 3: Determine the Range of Heat Evolved The heat evolved during physisorption typically lies in the range of 20-40 kJ/mol. This is due to the weak interactions involved in the process. **Hint:** Recall that the heat of physisorption is lower than that of chemisorption, which is why we expect a lower range of energy values. ### Step 4: Analyze the Options The options provided are: - A) 20-40 kJ/mol - B) 40-100 kJ/mol - C) 100-200 kJ/mol - D) 200-400 kJ/mol Since we have established that the heat evolved in physisorption is in the range of 20-40 kJ/mol, we can conclude that the correct answer is option A. **Hint:** Compare the established range with the provided options to make the correct choice. ### Final Answer The heat evolved in physisorption lies in the range of **20-40 kJ/mol** (Option A).
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