Question

Which of the following statement is incorrect for physical adsorption ?

• A. It is instantaneous
• B. Monomolecular layer forms on the adsorbent
• C. Less activation energy is required for it
• D. Generally it results at low temperature and adsorption decreases with increase in temperature

Answer 1

The correct option is B Monomolecular layer forms on the adsorbent

Physical adsorption Is an instantaneous process in which van der Waals' forces exist between the adsorbate and adsorbent. Thus, an activation energy of such adsorption is low and it results in the formation of multimolecular layer (more than one molecule thick).

Physisorption occurs at low temperature and decreases with rising in temperature.

Hence, option B is correct.