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Which of the following is incorrect?

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a
Enthalpy (numerical value) of physisorption is greater than that of chemisorption
b
Physisorption is not very specific but chemisorption is highly specific
c
Chemisorption takes place at relatively high temperatures
d
In physisorption generally multi-molecular layers are formed on the adsorption

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detailed solution

Correct option is A

Physisorption has a lower enthalpy (numerical value) than chemisorption. Vander Waals forces and other weak attraction forces cause physisorption, whereas specific strong forces cause chemisorption, which results in high enthalpy and high temperature reactions.

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