Question

The properties of physical adsorption are:

• A. Absorbate is held to the adsorbent by weak hydrogen bonds
• B. As the temperature increases, adsorption decreases
• C. A multilayer is possible
• D. Adsorption is reversible
• E. It is more specific

Answer 1

Answer: (B), (C), (D)

The correct options are
B As the temperature increases, adsorption decreases
C A multilayer is possible
D Adsorption is reversible

In physisorption, the adsorbate and adsorbent are held together by weak van der Waal's forces, adsorption decreases as the temperature increases and increases as the pressure increases.
It is a non-specfic, reversible process and multilayer is also possible.