STATEMENT -1 : On dilution, molarity of solution changes.
and
STATEMENT -2 : Number of moles of solute in a solution does not change on dilution.

Options

A. Statement -1 is True, Statement -2 is True, Statement -2 is a correct explanation for Statmenet -1.
B. Statement -1 is True, Statement -2 is True, Statement-2 is NOT a correct explanation for Statement -1
C. Statement -1 is True, Statement -2 is False
D. Statement -1 is False, Statmenet -2 is True

Answer

To solve the question, we need to analyze the two statements provided:

**Statement 1:** On dilution, molarity of solution changes.
**Statement 2:** Number of moles of solute in a solution does not change on dilution.

### Step-by-Step Solution:

1. **Understanding Molarity:**
- Molarity (M) is defined as the number of moles of solute divided by the volume of the solution in liters.
- The formula for molarity is:
\[ \text{Molarity (M)} = \frac{\text{Number of moles of solute}}{\text{Volume of solution in liters}} \]

2. **Effect of Dilution on Molarity:**
- When a solution is diluted, the volume of the solution increases because more solvent is added.
- Since molarity is inversely related to the volume of the solution (keeping the number of moles constant), an increase in volume will lead to a decrease in molarity.
- Therefore, **Statement 1** is true: on dilution, the molarity of the solution changes.

3. **Effect of Dilution on Number of Moles:**
- The number of moles of solute is determined by the amount of solute present before dilution.
- When a solution is diluted, the amount of solute does not change; only the volume of the solution changes.
- Therefore, **Statement 2** is also true: the number of moles of solute in a solution does not change on dilution.

4. **Relationship Between the Two Statements:**
- Statement 2 provides a correct explanation for Statement 1. Since the number of moles remains constant while the volume increases, the molarity must decrease.
- Thus, **Statement 2** is a correct explanation for **Statement 1**.

5. **Conclusion:**
- Both statements are true, and Statement 2 correctly explains Statement 1.
- Therefore, the correct answer is: **Option 1: Statement 1 is true, Statement 2 is true, and Statement 2 is a correct explanation for Statement 1.**

### Final Answer:
**Option 1: Statement 1 is true, Statement 2 is true, and Statement 2 is a correct explanation for Statement 1.**

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