Assertion`:-` Degree of hydrolysis and pH of a `WAWB` salt is independent of initial concentration of salt.
Reason`:-` The solution of `NH_(4)CN` in water has pH slightly greater than ?

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False

Explanation

To solve the question regarding the assertion and reason provided, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
**Assertion:** The degree of hydrolysis and pH of a weak acid-base (WAWB) salt is independent of the initial concentration of the salt.

- **Explanation:** The degree of hydrolysis (H) for a salt is given by the formula:
\[ H = \sqrt{\frac{K_w}{K_a \cdot K_b}} \]
where \( K_w \) is the ion product of water, \( K_a \) is the dissociation constant of the weak acid, and \( K_b \) is the dissociation constant of the weak base.
- The formula shows that the degree of hydrolysis depends only on the constants \( K_a \) and \( K_b \) and not on the initial concentration of the salt. Thus, the assertion is correct.

### Step 2: Analyze the Reason
**Reason:** The solution of \( NH_4CN \) in water has a pH slightly greater than 7.

- **Explanation:** \( NH_4CN \) is a salt formed from a weak base \( NH_4OH \) (ammonium hydroxide) and a weak acid \( HCN \) (hydrocyanic acid).
- When dissolved in water, the hydrolysis of \( NH_4^+ \) and \( CN^- \) occurs. Since \( HCN \) is a stronger acid than \( NH_4OH \) is a base, the solution will be slightly acidic.
- Therefore, the pH of the solution of \( NH_4CN \) will be slightly less than 7, not greater than 7. Thus, the reason is incorrect.

### Conclusion
- The assertion is correct, while the reason is incorrect. Therefore, the correct option is that the assertion is true, but the reason is false.

### Final Answer
The answer is **Option 3**: The assertion is true, but the reason is false.

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