ANS:C - increased utilisation of stagnant zones of the liquid phase.

Chemisorption compared to physical absorption has: Increased utilization of stagnant zones of the liquid phase. Chemisorption involves the formation of chemical bonds between the adsorbate molecules and the surface of the adsorbent. This process is often more specific and results in stronger bonds compared to physical absorption, which relies on weaker forces such as van der Waals interactions. In chemisorption, the adsorbate molecules undergo chemical reactions with the adsorbent surface, leading to the formation of new chemical species. This process can occur even in stagnant zones of the liquid phase where physical absorption might be less effective. Therefore, chemisorption can lead to increased utilization of stagnant zones in the liquid phase, enhancing overall adsorption efficiency. The other options, such as lower adsorption rate or lower capacity of the solvent for the solute gas, do not accurately describe the differences between chemisorption and physical absorption. Chemisorption can have different adsorption rates and capacities depending on the specific system and conditions.