Q1: In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.

ANS:B - gas

In the absorption process, ammonia gas is being dissolved into water. The liquid phase refers to the water into which the ammonia gas is being absorbed. The absorption process involves the transfer of the gas (ammonia) from the gas phase (the environment) into the liquid phase (the water). The resistance to this transfer occurs primarily within the liquid phase. Factors such as the solubility of ammonia in water, the surface area available for contact between the gas and liquid phases, the concentration gradient of ammonia between the gas and liquid phases, and the mass transfer coefficient (which characterizes the rate of mass transfer between phases) all contribute to the resistance encountered in the liquid phase during absorption. In summary, the liquid phase plays a significant role in determining how effectively ammonia gas is absorbed into water, making it the main resistance to absorption in this process.