ANS:D - none of these.

The wrong statement is: "high critical temperature is adsorbed in preference to a gas of low critical temperature." In physical adsorption, such as adsorption on solid surfaces, the preference typically favors gases with low critical temperatures. This is because gases with low critical temperatures tend to have weaker intermolecular forces and are therefore more readily adsorbed onto solid surfaces. So, the correct statement should be that gases with low critical temperatures are adsorbed in preference to gases with high critical temperatures.