In these colloids , a large number of small atoms or smaller molecules of a substance aggregate to form colloidal particles having size in colloidal range. These colloids are known as

Options

A. multimolecular colloids
B. macromolecular colloids
C. associated colloids
D. lyophilic colloids

Explanation

To solve the question regarding the type of colloids formed by the aggregation of small atoms or molecules into colloidal particles, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Colloids**:
- Colloids are mixtures where one substance is dispersed evenly throughout another. The particles in a colloid are larger than those in a solution but smaller than those in a suspension.

2. **Identifying Types of Colloids**:
- There are various types of colloids based on the size and nature of the dispersed phase:
- **Multi-molecular Colloids**: Formed by the aggregation of many small particles (atoms or molecules) that come together to form larger colloidal particles.
- **Macromolecular Colloids**: These consist of large molecules that are already in the colloidal size range.
- **Associative Colloids**: These behave as strong electrolytes at low concentrations but form micelles at higher concentrations.
- **Lyophilic Colloids**: These are solvent-attracting colloids and do not depend on the size of the dispersed phase.

3. **Analyzing the Question**:
- The question specifies that a large number of small atoms or molecules aggregate to form colloidal particles. This description aligns with the definition of multi-molecular colloids, where many smaller entities combine to create a colloidal particle.

4. **Conclusion**:
- Based on the definitions and characteristics of the different types of colloids, the correct answer to the question is **multi-molecular colloids**.

### Final Answer:
**Multi-molecular colloids**