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A : Arrhenius parameter (A) = P (steri...

A : Arrhenius parameter
(A) = P (steric factor) `xx` z (collision frequency)
R : On increasing temperature , the value of A increases.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1).

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2).

C

If Assertion is true statement but Reason is false, then mark (3).

D

If both Assertion and Reason are false statements , then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the assertion and reason provided regarding the Arrhenius parameter (A) in the context of chemical kinetics. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that the Arrhenius parameter (A) can be expressed as the product of the steric factor (P) and the collision frequency (Z). - The Arrhenius equation is given by: \[ k = A \cdot e^{-\frac{E_a}{RT}} \] - Here, \( A \) is the pre-exponential factor, which indeed can be represented as \( A = P \cdot Z \). 2. **Analyzing the Components**: - **Steric Factor (P)**: This factor accounts for the geometry of the reacting molecules and how effectively they can collide to react. - **Collision Frequency (Z)**: This is the number of collisions that occur per unit time between the reacting species. 3. **Conclusion on Assertion**: - Since \( A = P \cdot Z \) is a valid representation, the assertion is **True**. 4. **Understanding the Reason**: - The reason states that on increasing temperature, the value of A increases. - However, the pre-exponential factor \( A \) is generally considered to be a constant for a given reaction at a specific set of conditions. It does not change with temperature. 5. **Conclusion on Reason**: - Since \( A \) does not change with temperature, the reason is **False**. 6. **Final Evaluation**: - The assertion is true, while the reason is false. Therefore, the correct option is that the assertion is true but the reason is false. ### Final Answer: The assertion is true, but the reason is false. ---
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