Which among the following gases is least adsorbed on solid at similar conditions of temperature and pressure?

Step-by-step solution

The extent of physisorption depends directly on a gas's ease of liquefaction, which is governed by intermolecular forces and critical temperature. Stronger intermolecular forces and higher critical temperatures correspond to greater adsorption. Examining the gases: SO ₂ ( T_c = 157.5^ C ) exhibits significant dipole-dipole interactions; Cl ₂ ( T_c = 144^ C ) experiences strong London dispersion forces; NH ₃ ( T_c = 132.4^ C ) forms hydrogen bonds; H ₂ ( T_c = -239.9^ C ) has minimal intermolecular forces due to its