False

Explanation:
When the operating line touches the equilibrium line in an absorber, it indicates that the liquid and gas phases are in equilibrium at that point. This means that there is no driving force for further separation, and the separation process cannot proceed.

Operating Line:
The operating line represents the relationship between the liquid and gas phases in an absorber. It shows the composition of the liquid leaving the absorber (y-axis) as a function of the composition of the gas entering the absorber (x-axis). The operating line is typically determined by the mass transfer rate and equilibrium data.

Equilibrium Line:
The equilibrium line represents the relationship between the liquid and gas phases in equilibrium. It shows the composition of the liquid (y-axis) in equilibrium with the composition of the gas (x-axis) at a given temperature and pressure. The equilibrium line is determined by the equilibrium data.

Separation in an Absorber:
The purpose of an absorber is to separate a particular component from a gas stream by contacting it with a liquid stream. The separation occurs through the transfer of the component from the gas phase to the liquid phase, based on the differences in composition and the driving force for mass transfer.

Touching of Operating Line and Equilibrium Line:
When the operating line touches the equilibrium line, it means that the compositions of the liquid and gas phases are the same at that point. This indicates that the system has reached equilibrium and further separation is not possible. The driving force for mass transfer is zero, as there is no difference in composition between the two phases.

Conclusion:
In an absorber, if the operating line touches the equilibrium line, it signifies that the separation process cannot proceed further. The system has reached equilibrium, and there is no driving force for mass transfer. Therefore, the correct answer is option 'B' - False.