Given

On the basis of data given above, predict which of the following gases shows the least adsorption on a definite amount of charcoal?

Critical temperature (Tc) is the highest temperature at which a substance can exist as a liquid.

• High Critical Temperature: Indicates strong intermolecular attractive forces. The gas is easily liquefied and therefore undergoes more adsorption.
• Low Critical Temperature: Indicates weak intermolecular attractive forces. The gas is difficult to liquefy and therefore undergoes less adsorption.

From this, we can establish a direct relationship: Extent of adsorption is directly proportional to the Critical Temperature of the gas.