Which of the following constitute irreversible colloidal system in water as dispersion medium

Options

A. Clay
B. Platinum
C. `Fe (OH)_(3)`
D. All of these

Explanation

To determine which of the following constitute an irreversible colloidal system in water as the dispersion medium, we need to understand the characteristics of irreversible colloidal systems and the types of colloids.

### Step-by-Step Solution:

1. **Define Irreversible Colloidal Systems**:
- An irreversible colloidal system is one where the dispersed phase does not revert to a colloidal solution upon the removal of the dispersion medium. This typically occurs in lyophobic colloids, which are not easily miscible with the dispersion medium (in this case, water).

2. **Identify Lyophobic Colloids**:
- Lyophobic colloids (meaning "liquid-hating") do not form stable colloidal solutions and can be separated from the dispersion medium through methods like evaporation. Examples include metal sols and certain non-polar substances.

3. **Analyze Given Options**:
- Without specific options provided in the question, we can generally say that any colloidal system that is lyophobic will be irreversible. Common examples include:
- Metal colloids (like gold or silver sols)
- Certain oxides (like ferric oxide in water)
- Other non-polar substances dispersed in water.

4. **Conclusion**:
- If the options given include any lyophobic colloids, those will constitute irreversible colloidal systems in water. Therefore, the answer would include all options that are identified as lyophobic colloids.

5. **Final Answer**:
- If options A, B, C, and D all include examples of irreversible colloidal systems (lyophobic), then the answer is that all of these options are correct.