Question

The adsorption of hydrogen by metals is called
A.Dehydrogenation
B.Hydrogenation
C.Occlusion
D.Adsorption

Answer 1

Adsorption is a process of formation of a film or a coating of the adsorbate on the surface of the adsorbent. It is a result of Van der Waals force between the molecules of the adsorbate and the adsorbent. Adsorption of a gas on a metal surface is known as occlusion. The metals which adsorb hydrogen include $Fe,Au,Pt$ and $Pd$ .

Complete step by step answer:
Adsorption is a process of formation of a film or a coating of one substance on the surface of the other. The substance which gets adsorbed is known as the adsorbate and the surface is known as the adsorbent. Adsorption is a result of Van der Waals force between the molecules of the adsorbate and the adsorbent. This process is used in various physical, chemical and biological systems in industries; It is used in activated charcoal, catalysts and provides cold water for air conditioning.
Certain metals adsorb hydrogen on their surface and this process is of dissociative chemisorption type. The heat of the reaction for adsorption of hydrogen atoms on the surface is high. This heat decreases with increase in the surface that undergoes adsorption. The metals which adsorb hydrogen include $Fe,Au,Pt$ and $Pd$ .
Adsorption of a gas on a metal surface is known as occlusion. Thus, the process of adsorption of hydrogen on a metal surface is known as Occlusion and the hydrogen is said to be occluded hydrogen.

Therefore, for the above question the correct answer is option C.

Note:
Hydrogen is used in various industries like petroleum refining, producing fertilizers and food processing. Hydrogen is also used as a fuel in rockets and automobiles. Fuel cells are more efficient and are a constant source of electricity and contain hydrogen.