a finely divided substance more effective as an adsorbent (T/F)

Answer

To determine whether the statement "a finely divided substance is more effective as an adsorbent" is true or false, we can analyze the properties of finely divided substances and their relationship to adsorption.

### Step-by-Step Solution:

1. **Understanding Adsorption**:
- Adsorption is the process where molecules from a gas or liquid adhere to the surface of a solid or liquid. The effectiveness of an adsorbent depends on its surface area.

2. **Defining Finely Divided Substances**:
- A finely divided substance refers to a material that has been broken down into very small particles or powder. This increases the surface area available for adsorption.

3. **Surface Area Consideration**:
- The effectiveness of an adsorbent is directly related to its surface area. The greater the surface area, the more sites are available for adsorption to occur.

4. **Comparing Forms of Substances**:
- When comparing a finely divided substance (powdered form) to its crystalline form, the powdered form has a significantly larger surface area. This means it can adsorb more molecules.

5. **Conclusion**:
- Since a finely divided substance has a greater surface area than its crystalline counterpart, it is indeed more effective as an adsorbent. Therefore, the statement is **True**.

### Final Answer:
The statement "a finely divided substance is more effective as an adsorbent" is **True**.