Question

Which one of the following is not a property of physical adsorption?

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> JEE Mains 2018

Answer 1

Since adsorption is accompanied by the release of heat energy, so in accordance with Le-Chatelier’s principle, it can be said that the increase in temperature decreases the extent of adsorption and vice versa.
The specific area of an adsorbent is the surface area that is available for adsorption per gram of adsorbent. Greater the surface area of adsorbent, greater will be the extent of adsorption.
Since, physical adsorption is reversible, it is accompanied by a decrease in pressure. Thus, it is expected that at a constant temperature, the extent of adsorption will increase with the increase in the pressure of the gas.
Since there are no specific bonds between the adsorbent and adsorbate, multi-layer adsorption can take place.
So, the incorrect statement is (d)