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When hydrogen is passed over Pd, hydroge...

When hydrogen is passed over Pd, hydrogen is adsorbed over the surface of Pd, this process is called

A

hydrogenation

B

occlusion

C

evaporation

D

halogenation

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Process**: The question asks about the phenomenon that occurs when hydrogen gas is passed over palladium (Pd) and gets absorbed on its surface. 2. **Identifying the Term**: The process of a gas being absorbed onto a solid surface is known as "adsorption." However, in this specific context, where hydrogen is absorbed into the bulk of the palladium, the correct term is "occlusion." 3. **Definition of Occlusion**: Occlusion refers to the process where a gas (in this case, hydrogen) is absorbed into the lattice structure of a metal (like palladium), allowing the metal to hold a significant amount of gas within its structure. 4. **Palladium's Capacity**: It is noteworthy that palladium can absorb a large volume of hydrogen, approximately 900 times its own volume, which is a characteristic feature of this metal. 5. **Conclusion**: Therefore, the correct answer to the question is that the process of hydrogen being absorbed over the surface of palladium is called "occlusion." **Final Answer**: The process is called **Occlusion**. ---
**Step-by-Step Solution:** 1. **Understanding the Process**: The question asks about the phenomenon that occurs when hydrogen gas is passed over palladium (Pd) and gets absorbed on its surface. 2. **Identifying the Term**: The process of a gas being absorbed onto a solid surface is known as "adsorption." However, in this specific context, where hydrogen is absorbed into the bulk of the palladium, the correct term is "occlusion." 3. **Definition of Occlusion**: Occlusion refers to the process where a gas (in this case, hydrogen) is absorbed into the lattice structure of a metal (like palladium), allowing the metal to hold a significant amount of gas within its structure. ...
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