Crystalloids differ from colloids mainly is respect of :

Options

A. electrical behaviour
B. particle nature
C. particle size
D. solubility

Answer

To answer the question regarding how crystalloids differ from colloids, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Definition of Crystalloids**:
- Crystalloids are solutions that contain small particles that are less than 1 nanometer in size. These particles are typically ions or small molecules that are soluble in water.

2. **Definition of Colloids**:
- Colloids are mixtures where larger particles, ranging from 1 nanometer to 1000 nanometers, are dispersed in a medium. These particles are larger than those found in crystalloids and can include substances like gelatin or proteins.

3. **Particle Size Comparison**:
- The primary difference between crystalloids and colloids lies in their particle size. Crystalloids have particles smaller than 1 nanometer, while colloids have particles that range from 1 nanometer to 1000 nanometers.

4. **Nature of the Solutions**:
- Crystalloids are typically clear solutions, as the small particles do not scatter light significantly. In contrast, colloids can appear cloudy or opaque due to the larger size of their dispersed particles, which scatter light.

5. **Examples**:
- Examples of crystalloids include saline solutions and sugar solutions. Examples of colloids include milk, blood, and gelatin.

6. **Conclusion**:
- In summary, crystalloids and colloids differ mainly in terms of particle size, with crystalloids having smaller particles (less than 1 nanometer) and colloids having larger particles (1 nanometer to 1000 nanometers).

### Final Answer:
Crystalloids differ from colloids mainly in respect of particle size, with crystalloids having particles smaller than 1 nanometer and colloids having particles ranging from 1 nanometer to 1000 nanometers.