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  1. After throttling, gas temperature

  2. A.

     Decreases

    B.

     Increases

    C.

     Remains same

    D.

     May increase or decrease ; depends on the nature of the gas

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  3. Critical temperature is defined as the temperature above which a gas will

  4. A.

     Not liquify (barring exceptions)

    B.

     Immediately liquify

    C.

     Never liquify however high the pressure may be

    D.

     None of these

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  5. Equation which relates pressure, volume and temperature of a gas is called the

  6. A.

     Equation of state

    B.

     Gibbs Duhem equation

    C.

     Ideal gas equation

    D.

     None of these

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  7. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is

  8. A.

     Zero

    B.

     Positive

    C.

     Negative

    D.

     None of these

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  9. The free energy change for a chemical reaction is given by (where, K = equilibrium constant)

  10. A.

     RT lnK

    B.

     -RT lnK

    C.

     -R lnK

    D.

     T lnK

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  11. All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.

  12. A.

     Oxygen

    B.

     Nitrogen

    C.

     Air

    D.

     Hydrogen

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  13. For equilibrium process (i.e. reversible) in an isolated system

  14. A.

     ds = 0

    B.

     ds < 0

    C.

     ds > 0

    D.

     ds = Constant

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  15. Which of the following decreases with increase in pressure?

  16. A.

     Melting point of ice

    B.

     Melting point of wax

    C.

     Boiling point of liquids

    D.

     None of these

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  17. At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero. This follows from the

  18. A.

     Third law of thermodynamics

    B.

     Second law of thermodynamics

    C.

     Nernst heat theorem

    D.

     Maxwell's relations

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  19. An isentropic process is carried out at constant

  20. A.

     Volume

    B.

     Pressure

    C.

     Temperature

    D.

     All of the above

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