1.

    A binary liquid mixture of components A and B exhibits an azeotrope at a specific composition. Which of the following statements is ALWAYS true about this azeotropic mixture?

    A

    The composition of the vapor phase is identical to the composition of the liquid phase.

    B

    The boiling point of the azeotrope is the average of the boiling points of pure A and B.

    C

    The azeotrope can be separated into pure A and B by fractional distillation.

    D

    The azeotrope always shows a positive deviation from Raoult's Law.

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    1.

    A binary solution of liquids A and B shows positive deviation from Raoult's law. Which of the following statements is TRUE?

    A

    The intermolecular forces between A and B are weaker than those between A-A and B-B.

    B

    The intermolecular forces between A and B are stronger than those between A-A and B-B.

    C

    The solution exhibits a negative deviation from Raoult's law.

    D

    The total vapor pressure of the solution is less than the sum of the vapor pressures of the pure components.

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    2.

    A mixture of two volatile liquids A and B shows a negative deviation from Raoult's law. Which of the following statements is INCORRECT regarding this mixture?

    A

    The enthalpy of mixing is negative.

    B

    The volume of mixing is negative.

    C

    The boiling point of the mixture is lower than that predicted by Raoult's law.

    D

    The intermolecular forces between A and B are stronger than the A-A and B-B interactions.

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