Which of the following statements is true with respect to the extent of physisorption?a.Increases with increase in temperatureb.Decreases with increase in temperaturec.Decreases with increase in surface aread.Decreases with increase in the strength of Van der Waals forces

The correct statement with respect to the extent of physisorption is b. Decreases with increase in temperature.

Here's why:

Physisorption, also known as physical adsorption, is a process in which the concentration of molecules increases at the surface of a solid or liquid, due to the van der Waals forces.

a. It is incorrect because physisorption decreases with an increase in temperature. This is because physisorption is an exothermic process, meaning it releases heat. As the temperature increases, the process becomes less favorable.

b. This is correct. As mentioned above, physisorption decreases with an increase in temperature.

c. This is incorrect because physisorption actually increases with an increase in surface area. The more surface area available, the more space there is for molecules to be adsorbed.

d. This is also incorrect. The extent of physisorption increases with an increase in the strength of the van der Waals forces. The stronger these forces, the more likely molecules are to be adsorbed.