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_________________?
A. Vapor phase obeys Daltons law and liquid phase obeys Raoults law

B. Liquid phase obeys Daltons law and vapor phase obeys Raoults law

C. Only vapor phase follows Raoults law

D. Only liquid phase obeys Daltons law

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