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Which of the following is an example of physical adsorption?
Adsorption of gas on activated charcoal
Adsorption of solute on the surface of a solvent
Adsorption of a metal ion on a metal oxide surface
Adsorption of a protein on a biological membrane
Answers (1)
Physical adsorption mainly occurs between gas molecules and solid surfaces. An example of physical adsorption is the adsorption of gas on activated charcoal. The weak Van der Waals forces between the gas molecules and the activated charcoal surface cause the gas to get adsorbed. Adsorption of solute on the surface of a solvent is an example of solvation, not physical adsorption. Adsorption of a metal ion on a metal oxide surface and adsorption of a protein on a biological membrane are examples of chemical adsorption.
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