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A gas can be liquefied by pressure alone...

A gas can be liquefied by pressure alone when its temperature

A

higher than its critical temperature

B

lower than its critical temperature

C

either of these

D

none

Text Solution

Verified by Experts

The correct Answer is:
B
A gas cab be liquefied only if its temperature is lower than its critical temperature.
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CO_(2) gas can be liquefied under pressure between

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The essential conditions for liquefaction of gases were discovered by Andrews in 1869 as a result of his study of pressure-volume-temperature relationship for CO_(2) . If was found that above a certain temperature, it was impossible to liquefy a gas whatever the pressure was applied. The temperature below which the gas can be liquefied by the application of pressure alone is called critical temperature (T_(c)) . The pressure required to liquefy a gas at this temperature is called the critical pressure (P_(c)) . The volume occupied by one mole of the substance at the critical temperature and pressure is called critcal volume. Critical constants are related with van der Waals' constant as follows: V_(c) = 3b, P_(c) = (a)/(27b^(2)), T_(c) = (8a)/(27 Rb) Gas A and can be liquefied at room temperature by applying pressure but gas B cannot. This reflects:

Knowledge Check

  • A gas can be liquefied if:

    A
    forces of attraction are low under ordinary conditions
    B
    forces of attraction are high under ordinary conditions
    C
    forces of attraction are zero under ordinary conditions
    D
    forces of attraction either high or low under ordinary conditions

  • A real gas can be liquefied:

    A
    under adiabatic expansion
    B
    above critical temperature
    C
    when cooled below critical temperature under applied pressure
    D
    at temperature lower than critical temperature and pressure higher than critical pressure

  • The temperature below which a gas should be cooled before it can be liquefied by pressure only is termed as

    A
    critical temperature
    B
    triple point
    C
    dew point
    D
    freezing point
    • A2Z-STATES OF MATTER-Section D - Chapter End Test
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    2. Boyle's law may be experssed as .

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    7. The KE of N molecule of O(2) is x joules at -123^(@)C. Another sample...

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    8. If for two gases of molecular weights M(A) and M(B) at temperature T(A...

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    9. A helium atom is two times heavier than a hydrogen molecule. At 298 K,...

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    10. Dalton's law of partial pressures is not applicable to

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    12. Which of the following curves does not represent Boyle's law?

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    13. The temperature of an ideal gas is increased from 140 K to 560 K. If a...

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    14. The behaviour of a real gas is usually depicted by plotting compressib...

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