Q1: Pick out the wrong statement.

ANS:A - Mass transfer co-efficient does not account for gase-liquid diffusion.

The statement "Mass transfer coefficient does not account for gas-liquid diffusion" is incorrect. Mass transfer coefficient does indeed account for gas-liquid diffusion, especially in processes involving absorption or stripping, where mass transfer occurs between a gas phase and a liquid phase. In mass transfer processes, such as gas-liquid absorption or stripping, the mass transfer coefficient (often denoted as 𝑘GkG​ or 𝑘LkL​) quantifies the rate at which a solute (or component) transfers from one phase to another per unit area of the interface between the phases. This rate is influenced by several factors, including the concentration gradient of the solute, the properties of the phases involved (such as diffusivities and viscosities), and the characteristics of the interface (such as interfacial area and turbulence). Gas-liquid diffusion plays a crucial role in determining the mass transfer rate across the interface between the gas and liquid phases. It governs the transport of the solute molecules from the bulk of one phase to the interface and subsequently into the bulk of the other phase. The mass transfer coefficient accounts for this diffusion process by incorporating factors related to diffusivities and concentration gradients into its definition. Therefore, it would be more accurate to say that the mass transfer coefficient takes into account gas-liquid diffusion, rather than the statement implying otherwise.