Q1: In case of a desorber (stripper), the

ANS:B - operating line always lies below the equilibrium curve.

In a desorber, also known as a stripper, the objective is to remove one or more components from a liquid by vaporization or stripping. The operating line represents the conditions of the liquid and vapor leaving the stage, while the equilibrium curve represents the equilibrium conditions between the liquid and vapor phases. The correct statement regarding the position of the operating line relative to the equilibrium curve in a desorber is: Operating line always lies above the equilibrium curve. This is because in a desorber, the stripping gas (typically a vapor) is introduced to remove components from the liquid phase. The operating line represents the conditions required to achieve the desired separation, and it typically lies above the equilibrium curve to ensure that sufficient driving force is maintained for the mass transfer process to occur.