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each question contain STATEMENT-1(Assert...

each question contain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below :
STATEMENT-1: More heat evolved in physiorpiton than in chemisorption.
STATEMENT-2: Molecules of adsorbate and adsorbent are held by van der Waal's forces in physisorption and by chemical bonds in chemisorption.

A

if both the statement are TRUE and STATEMENT -2 is the correct explanation of STATEMENT - 1

B

If both the statement are STATEMENT -2 is NOT the correct explanation of STATEMENT -1

C

If STATEMENT -1 is TRUE and STATEMENT is FALSE

D

If STATEMENT -1 is FALSE and STATEMENT -2 is TRUE

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given statements, we will evaluate each assertion and reason step by step. ### Step 1: Understanding Statement 1 **Statement 1:** "More heat evolved in physisorption than in chemisorption." - Physisorption involves the adsorption of molecules onto a surface through weak Van der Waals forces. The heat released during physisorption is relatively low, typically around 20 kJ/mol. - Chemisorption, on the other hand, involves the formation of strong chemical bonds between the adsorbate and the adsorbent. The heat released during chemisorption is much higher, generally around 200 kJ/mol. **Conclusion for Statement 1:** This statement is **false** because more heat is evolved in chemisorption than in physisorption. ### Step 2: Understanding Statement 2 **Statement 2:** "Molecules of adsorbate and adsorbent are held by Van der Waals forces in physisorption and by chemical bonds in chemisorption." - In physisorption, the interaction between the adsorbate and adsorbent is indeed due to weak Van der Waals forces. - In chemisorption, the interaction is due to the formation of strong chemical bonds. **Conclusion for Statement 2:** This statement is **true** because it accurately describes the nature of the forces involved in both types of adsorption. ### Final Conclusion - **Statement 1** is **false**. - **Statement 2** is **true**. Thus, the correct answer is that Statement 1 is false and Statement 2 is true.
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