(B) Physical adsorption is an exothermic process,meaning the enthalpy of adsorption $(\Delta H_{ads})$ is always negative,typically ranging from $20-4

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The enthalpy of adsorption $(\Delta H_{ads})$ is low and positive.

(B) Physical adsorption is an exothermic process,meaning the enthalpy of adsorption $(\Delta H_{ads})$ is always negative,typically ranging from $20-40 \ kJ/mol$.Option $B$ states that the enthalpy is positive,which is incorrect.

Class 12 Chemistry Surface Chemistry Adsorption and Adsorption isotherm

Easy

Which of the following statements is incorrect regarding physical adsorption?

A
It results in multi-molecular layers on the adsorbent surface under high pressure.
B
The enthalpy of adsorption $(\Delta H_{ads})$ is low and positive.
C
It occurs due to van der Waals forces.
D
Gases that liquefy easily are adsorbed more readily.