The magnitude of colligative properties in colloidal dispersions is …..than solution

Options

A. Lower
B. Higher
C. Both
D. None

Answer

**Step-by-Step Solution:**

1. **Understanding Colligative Properties**: Colligative properties are properties of solutions that depend on the number of solute particles in a given volume of solvent and not on the nature of the solute. These properties include boiling point elevation, freezing point depression, vapor pressure lowering, and osmotic pressure.

2. **Distinction Between True Solutions and Colloidal Dispersions**: A true solution is a homogeneous mixture where the solute particles are at the molecular or ionic level (typically around 1 nm in size). In contrast, colloidal dispersions contain larger particles, ranging from 1 nm to 1000 nm.

3. **Effect of Particle Size on Number of Moles**: Since colligative properties depend on the number of solute particles, the larger particle size in colloidal dispersions means that there are fewer moles of solute present in a given volume compared to a true solution. This is because the same volume of solvent can accommodate fewer larger particles than smaller ones.

4. **Conclusion on the Magnitude of Colligative Properties**: Because the number of moles of solute is lower in colloidal dispersions due to the larger size of the particles, the magnitude of colligative properties in colloidal dispersions will be lower than that in true solutions.

5. **Final Answer**: The magnitude of colligative properties in colloidal dispersions is **lower** than in true solutions.

---