Question

Physical adsorption is appreciable at:

• A. higher temperature
• B. lower temperature
• C. room temperature
• D. ${100}^{o}C$

Answer 1

The correct option is B lower temperature

Weak van der Waals' forces of attractions are present between the molecules of the adsorbate and the adsorbent in the physical adsorption .so it requires less energy for the accumulation of adsorbate on the adsorbent , hence physical adsorption occurs at low temperature.
Hence option B is correct.