Which of the following statement is not correct [MP PET 1993]

1.	Which of the following statement is not correct [MP PET 1993]
A.	Physical adsorption is due to Vander Wall's forces
B.	Chemical adsorption decreases at high temperature and low pressure
C.	Physical adsorption is reversible
D.	Adsorption energy for a chemical adsorption is generally greater than that of physical adsorption
Answer» C. Physical adsorption is reversible

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