Choose the correct statement

Options

A. The boiling point of the solution falls on increasing the amount of the solute
B. The freezing point of the solution is lowered on adding more of solvent
C. The freezing point of the solution is raised on adding more of solute
D. The freezing point of the solution decreases on increasing the amount of the solute

Explanation

To solve the question regarding colligative properties and choose the correct statement, let's break down the concepts step by step.

### Step-by-Step Solution:

1. **Understanding Colligative Properties**:
- Colligative properties are properties that depend on the number of solute particles in a solution, not on the nature of the solute. The main colligative properties include:
- Relative lowering of vapor pressure
- Elevation of boiling point
- Depression of freezing point
- Osmotic pressure

**Hint**: Remember that colligative properties are influenced by the quantity of solute, not its identity.

2. **Analyzing the Statements**:
- We need to evaluate the given statements one by one based on our understanding of colligative properties.

3. **Statement 1**: "The boiling point of the solution falls on increasing the amount of the solute."
- This statement is **incorrect**. The boiling point of a solution actually **increases** when a non-volatile solute is added (elevation of boiling point).

**Hint**: Recall that adding a solute raises the boiling point, not lowers it.

4. **Statement 2**: "The freezing point of the solution lowers on adding more of the solvent."
- This statement is **incorrect**. The freezing point lowers when a solute is added, not when more solvent is added.

**Hint**: Focus on the effect of solute addition, not solvent.

5. **Statement 3**: "The freezing point of the solution raises."
- This statement is also **incorrect**. The freezing point of a solution decreases when a solute is added (depression of freezing point).

**Hint**: Remember that the freezing point depression occurs due to the addition of solute.

6. **Statement 4**: "The freezing point of the solution decreases on increasing the amount of the solute."
- This statement is **correct**. The freezing point indeed decreases as the concentration of the solute increases.

**Hint**: Increasing solute concentration always leads to a decrease in freezing point.

### Conclusion:
The correct statement is: **"The freezing point of the solution decreases on increasing the amount of the solute."**