Which of the following statement is not correct?

• A

  Physical adsorption is due to vander Waals ,forces

• B

  Physical adsorption is irreversible

• C

  chemical adsorption increases with increase in temperature upto certain limit than decreases

• D

  Enthalpy of adsorption (|$∆$HI) for a chemical adsorption is greater than that of physical adsorption