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  • Which one of the following characteristics is not correct for physical adsorption?Option: 1 Adsorption on solids is reversible<div clas

Which one of the following characteristics is not correct for physical adsorption?

Option: 1

Adsorption on solids is reversible


Option: 2

Adsorption increases with increase in temperature


Option: 3

Adsorption is spontaneous


Option: 4

Both enthalpy and entropy of adsorption are negative.


Answers (1)

best_answer

Physical adsorption is an exothermic process but its enthalpy of adsorption is negative. This is because the attraction between the gas molecules and solid surfaces is only due to weak Van der Waals forces. So, Adsorption is a spontaneous process.

Physical adsorption is an exothermic process. Therefore, a rise in temperature will decrease adsorption. (Le chatelier principle).

So, option 2 is correct.

Posted by

Divya Prakash Singh

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