There is desorption of physical adsorption when:

Question

Question

This question was previously asked in

DSSSB PGT Chemistry (Female) Official Paper (Held On: 06 Jul, 2018 Shift 1)

Answer 1

CONCEPT:

Physical Adsorption

Physical adsorption occurs due to weak intermolecular forces like Van der Waals forces between the adsorbate and adsorbent.
This type of adsorption is generally reversible and is influenced by temperature and pressure.
Desorption in physical adsorption refers to the process where the adsorbed particles are released from the surface of the adsorbent.

EXPLANATION:

Physical adsorption is highly dependent on temperature:
- When the temperature increases, the kinetic energy of the adsorbed molecules increases, leading to the breaking of weak intermolecular forces between the adsorbate and adsorbent.
- This results in desorption of the adsorbed particles.
Pressure also plays a role in physical adsorption:
- Increasing pressure usually favors adsorption, but it does not directly cause desorption.
Thus, desorption occurs primarily when the temperature increases.

Therefore, the correct answer is Temperature increases.