A: Molar conductivity of solution increase with dilution for weak electrolyte.
R: Degree of ionization increases with dilution.

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 both the assertion (A) and the reason (R) provided.

### Step-by-Step Solution:

1. **Understanding Molar Conductivity**:
- Molar conductivity (Λ) is defined as the conductivity (κ) of a solution divided by its molarity (C). It indicates how well a solution can conduct electricity.
- For weak electrolytes, the molar conductivity increases with dilution.

**Hint**: Remember that molar conductivity is related to the number of ions present in the solution.

2. **Effect of Dilution on Weak Electrolytes**:
- Weak electrolytes do not completely dissociate in solution. When a weak electrolyte is diluted, the concentration of the undissociated molecules decreases.
- According to Le Chatelier's principle, reducing the concentration of reactants (undissociated molecules) shifts the equilibrium to the right, leading to more dissociation into ions.

**Hint**: Consider how equilibrium shifts when the concentration of reactants changes.

3. **Degree of Ionization**:
- The degree of ionization (α) is the fraction of the total number of solute molecules that dissociate into ions.
- As the solution is diluted, the degree of ionization increases because more of the weak electrolyte dissociates into ions.

**Hint**: Think about how dilution affects the dissociation of weak electrolytes.

4. **Conclusion on Assertion and Reason**:
- Since the degree of ionization increases with dilution, the number of ions in the solution increases, leading to an increase in molar conductivity.
- Therefore, both the assertion (A) and the reason (R) are true, and the reason correctly explains the assertion.

**Hint**: Verify if the reason logically supports the assertion.

### Final Answer:
Both the assertion (A) and the reason (R) are true, and the reason correctly explains the assertion.