Question
Define adsorption with an example. Why is adsorption exothermic in nature? Write the types of adsorption based on the nature of forces between adsorbate and adsorbent.
✓
Answer
The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed adsorption. eg: gas like $O_2,\ H_2,\ CO,\ Cl_2,\ NH_3$ or $SO_2$ is taken in a closed vessel containing powdered charcoal.
Due to bond formation/interaction between adsorbent and adsorbate Physical (van der Waal’s adsorption) & Chemical (Langmuir adsorption).
Due to bond formation/interaction between adsorbent and adsorbate Physical (van der Waal’s adsorption) & Chemical (Langmuir adsorption).
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