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Which one of the following is not a property of physical adsorption ? [JEE-Main On line-2018]

1. Higher the pressure, more the adsorption
2. Greater the surface area, more the adsorption
3. Lower the temperature, more the adsorption
4. Unilayer adsorption occurs

Correct answer: Unilayer adsorption occurs

Solution

Unilayer adsorption is characteristic of chemisorption, where a single layer of adsorbate forms on the adsorbent surface, while physical adsorption can involve multilayer formation. Therefore, stating that unilayer adsorption occurs is incorrect in the context of physical adsorption.

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