Which of the following systems will show Tyndall effect ?

Options

A. Aqueous solution of sodium chloride
B. Aqueous solution of aluminium hydroxide
C. Aqueous solution of glucose
D. Aqueous solution of urea

Explanation

To determine which of the following systems will show the Tyndall effect, we need to understand what the Tyndall effect is and which types of solutions exhibit this phenomenon.

### Step-by-Step Solution:

1. **Understanding the Tyndall Effect**:
- The Tyndall effect is the scattering of light by small particles in a colloidal solution. When a beam of light passes through a medium containing small suspended particles, it gets scattered, making the path of the light visible.

2. **Identifying Types of Solutions**:
- Solutions can be classified into two main categories: true solutions and colloidal solutions.
- **True Solutions**: These are homogeneous mixtures where the solute particles are very small (less than 1 nanometer) and do not scatter light. Examples include saltwater and sugar water.
- **Colloidal Solutions**: These are heterogeneous mixtures where the solute particles are larger (greater than 1 nanometer) and can scatter light, thus showing the Tyndall effect.

3. **Analyzing Each Option**:
- **Option 1: Aqueous solution of sodium chloride**:
- This is a true solution because sodium chloride dissolves completely, forming particles that are too small to scatter light.
- **Conclusion**: Does not show Tyndall effect.

- **Option 2: Aqueous solution of aluminum hydroxide**:
- This is a colloidal solution. Aluminum hydroxide forms larger particles that can scatter light, thus exhibiting the Tyndall effect.
- **Conclusion**: Shows Tyndall effect.

- **Option 3: Aqueous solution of glucose**:
- This is also a true solution. Glucose dissolves completely, forming particles that are too small to scatter light.
- **Conclusion**: Does not show Tyndall effect.

- **Option 4: Aqueous solution of urea**:
- Similar to glucose, urea forms a true solution with particles that are too small to scatter light.
- **Conclusion**: Does not show Tyndall effect.

4. **Final Conclusion**:
- Among the options provided, only the aqueous solution of aluminum hydroxide (Option 2) is a colloidal solution that exhibits the Tyndall effect.

### Final Answer:
**Option 2: Aqueous solution of aluminum hydroxide shows the Tyndall effect.**