Which can adsorb maximum amount of `H_(2)`?

Options

A. A platinum black
B. Powdered palladium
C. A platinum rod
D. Nickel sphere

Answer

To determine which material can adsorb the maximum amount of hydrogen, we need to consider the relationship between surface area and adsorption. Adsorption is the process by which atoms, ions, or molecules from a gas, liquid, or dissolved solid adhere to a surface.

### Step-by-step Solution:

1. **Understand Adsorption**: Adsorption is influenced by the surface area of the adsorbent. A larger surface area allows for more sites for the gas molecules to adhere to.

2. **Identify the Materials**: We need to compare the materials provided in the question (not specified in the prompt, but let's assume common adsorbents like palladium, platinum, carbon, etc.).

3. **Evaluate Surface Areas**: Among the common materials used for hydrogen adsorption, palladium (Pd) is known for having a high surface area and excellent adsorption properties for hydrogen.

4. **Conclusion**: Based on the understanding that adsorption increases with surface area, and knowing that palladium has a higher surface area compared to other materials, we can conclude that palladium can adsorb the maximum amount of hydrogen.

5. **Final Answer**: Therefore, the material that can adsorb the maximum amount of hydrogen is **palladium**.