Assertion. Degree of ionization of weak electrolyte increases with dilution.
Reason. Degree of ionization is inversely proportional to molar concentration.

Options

A. If both assertion and reason are true, and reason is the true explanation of the assertion.
B. If both assertion and reason are true, but reason is not the true explanation of the assertion.
C. If aasertion is true, but reason is false.
D. If both assertion and reason are false.

Explanation

To solve the given question, we will analyze both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "the degree of ionization of a weak electrolyte increases with dilution."

- **Explanation**: When a weak electrolyte is diluted, the concentration of the electrolyte decreases. According to the principles of equilibrium, a decrease in concentration shifts the equilibrium position to the right, leading to an increase in the degree of ionization (α). Therefore, this assertion is true.

### Step 2: Understand the Reason
The reason states that "the degree of ionization is inversely proportional to molar concentration."

- **Explanation**: The degree of ionization (α) is indeed related to the concentration (C) of the electrolyte. According to Ostwald's dilution law, the degree of ionization can be expressed as:
\[ \alpha = \frac{\sqrt{K_a}}{\sqrt{C}} \]
This indicates that α is inversely proportional to the square root of the concentration (C). Thus, while it is true that as concentration decreases (dilution occurs), the degree of ionization increases, the statement that it is "inversely proportional to molar concentration" is not entirely accurate because it is inversely proportional to the square root of concentration.

### Step 3: Conclusion
- **Assertion**: True (degree of ionization increases with dilution).
- **Reason**: False (it is inversely proportional to the square root of concentration, not directly to concentration).

Thus, the final answer is that the assertion is true, but the reason is false.

### Final Answer:
- Assertion is true, Reason is false.