Negative Deviations from Raoult's Law Quiz
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Questions and Answers

What is the reason for negative deviations from Raoult's law?

  • Weaker intermolecular forces between similar molecules (correct)
  • Stronger intermolecular forces between similar molecules
  • Increased vapor pressure
  • Formation of azeotropes
  • What type of azeotrope forms when solutions show a large positive deviation from Raoult’s law?

  • Constant boiling azeotrope
  • Minimum boiling azeotrope (correct)
  • Ideal azeotrope
  • Maximum boiling azeotrope
  • What happens to the vapor pressure in a mixture that exhibits negative deviation from Raoult's law?

  • Becomes infinite
  • Decreases (correct)
  • Increases
  • Remains constant
  • Which pair of molecules exhibits negative deviation from Raoult's law due to hydrogen bonding?

    <p>Phenol and aniline</p> Signup and view all the answers

    Which pair of molecules is mentioned to form a solution with negative deviation from Raoult's law in the text?

    <p>Phenol and aniline</p> Signup and view all the answers

    Why is it not possible to separate components by fractional distillation in case of azeotropes?

    <p>Components have similar boiling points</p> Signup and view all the answers

    How does the addition of acetone to ethanol affect the hydrogen bonding in the solution?

    <p>Reduces hydrogen bonding</p> Signup and view all the answers

    What is the cause of positive deviations from Raoult's law?

    <p>Weaker solute-solvent interactions</p> Signup and view all the answers

    In a solution that shows negative deviation from Raoult's law, what can be said about the intermolecular interactions?

    <p>Solute-solvent interactions are stronger than solute-solute interactions</p> Signup and view all the answers

    Which type of solution shows positive deviations from Raoult's law according to the text?

    <p>Mixtures of ethanol and acetone</p> Signup and view all the answers

    What can be inferred about a solution that shows a negative deviation from Raoult's law based on the text provided?

    <p>Stronger solute-solute interactions than solvent-solvent interactions</p> Signup and view all the answers

    What is the composition of the azeotrope formed by nitric acid and water?

    <p>32% nitric acid and 68% water by mass</p> Signup and view all the answers

    What effect does weaker intermolecular interactions have on vapor pressure in a solution showing positive deviation from Raoult's law?

    <p>Increases vapor pressure</p> Signup and view all the answers

    Which class of solutions forms maximum boiling azeotropes at specific compositions?

    <p>Solutions showing large negative deviation from Raoult's law</p> Signup and view all the answers

    What happens when an azeotrope composition is reached during fractional distillation?

    <p>The liquid and vapor have the same composition</p> Signup and view all the answers

    In Raoult's law, what does a negative deviation indicate about the molecular interactions in the solution?

    <p>Stronger intermolecular interactions than expected</p> Signup and view all the answers

    Which property of solutions is associated with the elevation of the boiling point of the solvent?

    <p>Elevation of boiling point of the solvent</p> Signup and view all the answers

    What is the key characteristic of an azeotrope?

    <p>Fixed composition in liquid and vapor phases</p> Signup and view all the answers

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