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

Options

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)

Answer

To solve the question, we need to analyze the assertion and the reason given in the context of the Arrhenius equation.

### Step-by-Step Solution:

1. **Understanding the Arrhenius Equation**:
The Arrhenius equation is given by:
\[ k = A e^{-\frac{E_a}{RT}} \]
where:
- \( k \) = rate constant
- \( A \) = pre-exponential factor (Arrhenius parameter)
- \( E_a \) = activation energy
- \( R \) = universal gas constant
- \( T \) = temperature in Kelvin

2. **Identifying the Components of A**:
The pre-exponential factor \( A \) can be expressed as:
\[ A = P \times Z \]
where:
- \( P \) = steric factor (indicates the fraction of collisions that are effective)
- \( Z \) = collision frequency (the number of collisions per unit volume per unit time)

3. **Evaluating the Assertion**:
The assertion states that \( A \) is an Arrhenius parameter. This is true because \( A \) is indeed the pre-exponential factor in the Arrhenius equation.

4. **Evaluating the Reason**:
The reason states that on increasing temperature, the value of \( A \) increases. This is incorrect because \( A \) is considered to be independent of temperature. The steric factor \( P \) and collision frequency \( Z \) do not change with temperature in the context of the Arrhenius equation.

5. **Conclusion**:
Since the assertion is true but the reason is false, the correct answer is that the assertion is correct, but the reason is not.

### Final Answer:
The assertion is true, but the reason is false.

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