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Please explain the reason for the above phenomenon.
The van der Wall’s forces / molecular forces of attraction / cohesive forces are greater in easily liquefiable gases like NH3, SO2 etc. than permanent gases like H2, N2 etc. Due to this, easily liquefiable gases are adsorbed readily.Moreover, the critical temperatures of easily liquefiable gases are more than the permanent gases, therefore, higher is the critical temperature of the gas, greater is the extent of adsorption.