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    5.

    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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    9.

    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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    10.

    A mixture of sand, salt, and iron filings can be separated using a combination of methods. Which sequence is the most efficient?

    A

    Dissolution, filtration, evaporation, magnetic separation

    B

    Filtration, dissolution, evaporation, magnetic separation

    C

    Magnetic separation, dissolution, filtration, evaporation

    D

    Evaporation, filtration, dissolution, magnetic separation

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