Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when_________________?
Correct answer: D. Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
- A. Only vapor phase follows Raoult's law
- B. Only liquid phase obeys Dalton's law
- C. Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
- D. Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Explanation
For an ideal liquid solution, Raoult's law gives each component's partial pressure as xᵢPᵢ⁰, while Dalton's law relates partial pressure to vapour composition. Thus αAB = P_A⁰/P_B⁰ when the liquid obeys Raoult's law and the vapour obeys Dalton's law.
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