Which of the following can adsorb large volume of hydrogen gas?

Options

A. Finely divided platinum
B. Colloidal solution of palladium
C. Small pieces of palladium
D. A single metal surface of platinum

Explanation

To determine which of the given options can adsorb a large volume of hydrogen gas, we need to consider the concept of adsorption and the factors that influence it.

### Step-by-Step Solution:

1. **Understanding Adsorption**:
- Adsorption is a surface phenomenon where molecules adhere to the surface of a solid or liquid. The amount of gas that can be adsorbed depends on the surface area of the adsorbent.

2. **Surface Area and Adsorption**:
- The larger the surface area of the adsorbent, the greater the capacity for adsorption. This means materials with high surface area, such as colloids or porous substances, can adsorb more gas.

3. **Identifying the Options**:
- Review the options provided in the question. Common candidates for high adsorption capacity include metals like palladium, activated carbon, and certain metal oxides.

4. **Analyzing the Options**:
- Among the options, if palladium is listed, it is known for its ability to adsorb hydrogen gas due to its high surface area and catalytic properties.

5. **Conclusion**:
- Based on the understanding that palladium has a significant surface area and is effective in adsorbing hydrogen, we conclude that the option which can adsorb a large volume of hydrogen gas is **Palladium**.

### Final Answer:
The correct option is **Palladium**.