Why physisorption is multi-molecular whereas chemisorption is unimolecular ?

Physical adsorption is multimolecular while chemisorption is unimolecular. Why?

Why physisorption forms multi-molecular layers, whereas chemisorption forms unimolecular layers?

Chemisorption is highly specific in nature, whereas physisorption is not. Give reason.

Why heat of chemisorption is more than heat of physisorption?

Match the entries of Column-I with appropriate entries of Column-II {:("COLUMN - I ","COLUMN - II "),("A) Physisorption ","p) Always unimolecular "),("B) Activated adsorption ","q) Multi molecular "),("C) Chemisorption ","r) High temperature is required "),("D) Desorption ","s) Low pressure is required "):}

Which of the following statements is not true? a. Both physisorption and chemisorption are exothermic. b. Physisorption occurs with increase of free energy. c. Physisorption requires low activation energy but chemisorption requires high activation energy. d. The magnitude of chemisorption increases and that of physisorption decreases with rise in temperature.