Adsorption is multilayer in the case of

The number of incorrect statement/s from the following is/are:
$A.$ Water vapours are adsorbed by anhydrous calcium chloride.
$B.$ There is a decrease in surface energy during adsorption.
$C.$ As the adsorption proceeds,$\Delta H$ becomes more and more negative.
$D.$ Adsorption is accompanied by decrease in entropy of the system.

Under what conditions does the rate of physisorption increase?

What will be the effect of an increase in temperature on physical adsorption?

Which one of the following characteristics is associated with adsorption?

In the adsorption of acetic acid on activated charcoal,the acetic acid is an