Assertion : When a connection solution is diluted by acidic aqueous solution remains unchanged .
Reason: Product of moles of aolute and volume is equal to the molarity.

Options

A. if both assertion and reason are true and reason is thr correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reson are false.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states: "When a concentrated solution is diluted by adding an aqueous solution, molarity remains unchanged."
- This is incorrect. When a solution is diluted, the volume of the solution increases, which causes the molarity (moles of solute per liter of solution) to decrease. Therefore, the assertion is false.

2. **Understanding the Reason**:
- The reason states: "Product of moles of solute and volume is equal to the molarity."
- This statement is also incorrect. The correct relationship is that the product of molarity and volume gives the number of moles of solute, not the other way around. Therefore, the reason is also false.

3. **Conclusion**:
- Since both the assertion and the reason are false, the correct answer is option D: "Both assertion and reason are false."

### Final Answer:
The correct answer is option D: Both assertion and reason are false.