Related Questions

    1.

    Which of these is the correct formula for calculating molality?

    A

    Moles of solute / Liters of solution

    B

    Moles of solute / Kilograms of solvent

    C

    Grams of solute / Liters of solution

    D

    Grams of solute / Kilograms of solvent

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    3.

    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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    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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    8.

    Crystallization is a purification technique based on the principle of:

    A

    Difference in solubility of the compound and impurities at different temperatures

    B

    Difference in melting points of the compound and impurities

    C

    Difference in boiling points of the compound and impurities

    D

    Difference in densities of the compound and impurities

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