Joule–Thomson Effect Quiz
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Questions and Answers

What is the significance of the critical temperature of a gas?

  • It indicates the pressure required to liquefy the gas.
  • It determines the volume of one mole of the gas.
  • It represents the temperature at which a gas cannot be liquefied.
  • It measures the attractive forces between molecules. (correct)

    • Which method involves subjecting a gas to intense coldness to liquefy it?

  • Joule Thomson effect
  • Faraday's method
  • Claude's method
  • Linde's method (correct)

    • How does compression contribute to liquefaction of gases?

  • It decreases the critical temperature of the gas.
  • It decreases the attractive forces between molecules.
  • It increases the kinetic energy of the molecules.
  • It brings the molecules close together. (correct)

    • How does a decrease in temperature affect the liquefaction of gases?

    <p>Facilitates liquefaction (D)</p> Signup and view all the answers

    In which method is compression used as a means to achieve liquefaction?

    <p>Claude's method (A)</p> Signup and view all the answers

    Which technique involves both cooling and compression to achieve gas liquefaction?

    <p>Joule Thomson effect (D)</p> Signup and view all the answers

    What is the outcome of a gas being cooled in terms of kinetic energy and molecular velocity?

    <p>Kinetic energy decreases and molecular velocity decreases (D)</p> Signup and view all the answers

    Which physical condition influences the transformation of a gaseous substance into liquid state?

    <p>Temperature (A)</p> Signup and view all the answers

    What happens to the pressure required to liquefy a gas with an increase in temperature?

    <p>It increases (B)</p> Signup and view all the answers

    What is the critical temperature of a gas?

    <p>The temperature at which a gas can no longer exist in liquid form (C)</p> Signup and view all the answers

    Which method involves applying pressure to a gas to bring the molecules within the sphere of van der Waals forces for liquefaction?

    <p>Linde’s method (A)</p> Signup and view all the answers

    In the context of liquefaction, what does the critical pressure represent?

    <p>The maximum vapor pressure that the liquid can have (C)</p> Signup and view all the answers

    What causes the drop in temperature in the Joule Thomson effect?

    <p>Energy expenditure to overcome cohesive forces (C)</p> Signup and view all the answers

    How is liquid oxygen obtained based on the Joule Thomson effect?

    <p>By expanding air to low pressure regions (B)</p> Signup and view all the answers

    How does Linde's method differ from Faraday's method in terms of liquefaction?

    <p>Faraday compresses air at 200 atmospheres, while Linde expands air at low pressure (C)</p> Signup and view all the answers

    What is the purpose of Claude's apparatus in the liquefaction process?

    <p>To cool air by expanding it with a piston (A)</p> Signup and view all the answers

    What role does the fine orifice play in the Joule Thomson effect?

    <p>Allows gas expansion to low pressure regions (C)</p> Signup and view all the answers

    Why does expansion of gas molecules lead to cooling in the Joule Thomson effect?

    <p>It separates molecules causing an increase in intermolecular distance (C)</p> Signup and view all the answers

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