Peptization denotes:

Options

A. Digestion of food
B. Hydrolysis of proteins
C. Addition of a fresh colloidal solid to an electrolyte
D. Precipitation of solid from a colloidal dispersion

Answer

To solve the question "Peptization denotes:", we will analyze the options provided and determine which one correctly defines peptization.

### Step-by-Step Solution:

1. **Understanding Peptization**:
- Peptization is a process that involves the dispersion of freshly precipitated materials into a colloidal solution by the action of an electrolyte. This means that peptization helps to break down larger particles into smaller ones, allowing them to remain suspended in a colloidal form.

2. **Analyzing the Options**:
- **Option 1: Dissection of food**: This option refers to the physical breakdown of food, which is unrelated to the chemical process of peptization. Therefore, this option is incorrect.
- **Option 2: Hydrolysis of proteins**: Hydrolysis is a chemical reaction involving the breakdown of proteins into smaller peptides or amino acids, but it does not describe the process of peptization. Hence, this option is also incorrect.
- **Option 3: Addition of a fresh colloidal solid to an electrolyte**: This option aligns with the definition of peptization, as it involves the dispersion of a solid into a colloidal solution through the action of an electrolyte. This is the correct answer.
- **Option 4: Precipitation of solid from a colloidal dispersion**: This option describes the opposite process of peptization, where solids are removed from a colloidal solution rather than being dispersed into it. Therefore, this option is incorrect.

3. **Conclusion**:
- After evaluating all the options, we find that the correct answer to the question "Peptization denotes:" is **Option 3: Addition of a fresh colloidal solid to an electrolyte**.

### Final Answer:
Peptization denotes the addition of a fresh colloidal solid to an electrolyte.