Question

The gas with lower critical temperature is easily adsorbed on platinum. If true, then enter 1 else enter 0.

Answer 1

Hint: In general, a gas with higher critical temperature gets more readily adsorbed to more extent than a gas with lower critical temperature. This is only for physical adsorption only. However, in chemical adsorption, there is no such relationship because it occurs only if the gas can form a chemical bond with the solid.

Complete step by step answer:
Same adsorbent at same temperature will absorb different gases to different extent and the extent to which gases are adsorbed is proportional to the critical temperature of gas. Greater the critical temperature of a gas, greater is its liquifiability and greater the case of its adsorption and vice versa the reason being, that adsorption is a surface phenomenon and physical adsorption is all about the adhesive forces between adsorbate and adsorbent.
There also exist cohesive forces between gas molecules which are intermolecular forces. So, more physical adsorption would happen because of greater influence of the intermolecular forces.
Critical temperature is the temperature above which gases can't be liquefied no matter what the pressure is. Above critical temperature, increase in pressure won’t let liquefaction of gases happen because the molecules of gases above critical temperature have sufficient kinetic energy to overcome the effects of intermolecular forces.
Platinum undertakes chemisorption. There is no relationship between chemisorption and critical temperature.
So, the statement in the question is not true. Therefore, the answer is 0.

Note: If accumulation of gas on the surface of a solid occurs on account of weak van der Waals forces, then it is called as physical adsorption. When the gas molecules or atoms are held to the solid surface by chemical bonds, then it is called Chemical adsorption or chemisorption.Critical temperature is the temperature above which we can’t liquefy gas just by pressure alone. So, there will be negligible intermolecular attractions between the gas molecules beyond the critical temperature.