Colloides may be classified on the basis of types of
particles of the dispersed phase into

Options

A. Lyophilic colloids and lyophobic colloids
B. Sol, gel, aerosol, emulsion etc
C. Multimolecular, macromolecular and associated
colloids
D. Recersible and irreversible colloids

Answer

To classify colloids based on the type of particles in the dispersed phase, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Colloids**: Colloids are mixtures where one substance is dispersed evenly throughout another. They consist of two phases: the dispersed phase (the particles) and the continuous phase (the medium).

2. **Classification Based on Dispersed Phase**: Colloids can be classified based on the nature of the particles in the dispersed phase. This classification primarily divides colloids into two main categories:
- **Lyophilic Colloids**: These are colloids where the dispersed phase has a strong affinity for the continuous phase (solvent). They are often referred to as "liquid-loving" colloids. Examples include starch in water or proteins in water. They are reversible, meaning they can easily be re-dispersed if the solvent is removed.
- **Lyophobic Colloids**: These colloids have little to no affinity for the continuous phase. They are known as "liquid-hating" colloids and are often irreversible. Examples include metals like gold or silver in water. They do not easily disperse in the solvent and require specific conditions to remain in a colloidal state.

3. **Further Classification**: Beyond lyophilic and lyophobic, colloids can also be classified into:
- **Multi-molecular Colloids**: These consist of aggregates of many small particles (e.g., colloidal gold).
- **Macromolecular Colloids**: These are made up of large molecules (e.g., proteins, starch).
- **Associated Colloids**: These are formed by the association of smaller molecules or ions into larger aggregates (e.g., micelles formed by surfactants).

4. **Reversible and Irreversible Colloids**:
- **Reversible Colloids**: These can revert to their original state upon removal of the dispersing medium (e.g., lyophilic colloids).
- **Irreversible Colloids**: These cannot revert to their original state easily (e.g., lyophobic colloids).

### Final Classification:
Thus, colloids can be classified based on the type of particles in the dispersed phase into:
- **Lyophilic Colloids** (liquid-loving, reversible)
- **Lyophobic Colloids** (liquid-hating, irreversible)