The volume of gases ${\mathrm{H}}_2,{\mathrm{CH}}_4,{\mathrm{CO}}_2\&{\mathrm{NH}}_3$ adsorbed by 1g of activated charcoal at 298 K & 1 atm pressure are in the order

The amount of gas adsorbed by a solid depends on the nature of gas. In general, more easily liquefiable gases (i.e., higher critical temperature) are readily adsorbed as vander Waals forces are stronger near the critical temperatures.

Thus, 1g of activated charcoal adsorbs 380 mL of sulphur dioxide (critical temp. 157°C), 16 mL of methane (critical temp. -83°C) and 4.5 mL of hydrogen (critical temp. -240°C)