What are lyophobic colloids? Give one example for them.

Explanation

### Step-by-Step Solution:

1. **Definition of Lyophobic Colloids**:
- Lyophobic colloids are colloidal systems that do not have a strong affinity for the dispersion medium. This means that when lyophobic substances are mixed with a liquid (the dispersion medium), they do not easily form a stable colloidal solution.

2. **Characteristics of Lyophobic Colloids**:
- These colloids are typically formed from substances like metals and their sulfides.
- They tend to be unstable and can easily precipitate out of the solution if disturbed or if the conditions change (like temperature or pH).
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