Which of the following statements about a binary mixture vapor-liquid equilibrium (VLE) is false?

Question

A. The bubble point pressure for the mixture can never be above the pure component vapor pressures at mixture temperature.
B. Knowledge of the location of an azeotrope in a system is important in the design of separation processes for this system.
C. For a system behaving according to Raoult’s Law, the bubble-point pressure will be a line connecting the vapor pressures of the pure components.
D. The assumptions of Raoult’s Law are ideal solution for the liquid phase and ideal gas for the vapor phase.
E. None of the above are false.

Answer 1

A. Correct. This is false. The bubble point pressure can be much higher or much lower than either of the pure component vapor pressures at a given temperature. For non-ideal solutions, this is regularly the case.
B. Incorrect. This is true. Azeotropes provide separation limits during distillation.
C. Incorrect. This is true. The bubble-point pressure for a system behaving according to Raoult’s Law will be a line connecting the pure-component vapor pressures.
D. Incorrect. This is true. This is the definition of Raoult’s Law.
E. Incorrect. One of the statements is false.