The correct statements from the following about physical adsorptionI) Desorption of adsorbate gas from adsor-bent is not easy since chemical forces are involvedII) Its energy of activation is very low.III) Easily liquefiable gases are more readily adsorbed.

Desorption of adsorbate gas from the surface of adsorbent is easy in the case of physisorptionBecause weak vanderwaal forces are involvedstatement I is falseEa of physical adsorption is low;rate of physical adsorption is highGases with higher critical temperture are easily adsorbed physicallystatements 2&3 are true