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NH(3) can be liquefied at ordinary tempe...

`NH_(3)` can be liquefied at ordinary temperature without the application of pressure. But `O_(2)` cannot be because :

A

Its critical temperature is very high

B

Its critical temperature is low

C

Its critical temperature is moderate

D

Its critical temperature is higher than that of ammonia

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The correct Answer is:
B
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CO_(2) gas can be liquefied under pressure between

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:

MARVEL PUBLICATION-STATES OF MATTER : GASES AND LIQUIDS -Liquefaction of Gases Critical Teperature Pressure and Volume
  1. The Joule -Thomson coefficient for a gas is zero at .

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  2. An ideal gas obeying the kinetic theory of gases can be liquefied if

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  3. At the critical temperature

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  4. Dominance of strong repulsive forces among the molecules of the gas (Z...

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  5. A gas is liquified

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  6. The compressibility factor for an ideal gas is

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  7. The compressibility factor of gases is less than unity at STP. Therefo...

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  8. Dominance of strong repulsive forces among the molecules of the gas (Z...

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  9. The temperature at which a real gas obeys the ideal gas laws over a wi...

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  10. The critical temperature of a substance is

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  11. NH(3) can be liquefied at ordinary temperature without the application...

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  12. At the critical temperature , the substance exists as a

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  13. The deviation from the ideal gas behaviour of a gas can be expressed a...

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  14. An ideal gas cannot be liquified because

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  15. Which of the following method is used for liquefaction of gases ?

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  16. Which set of conditions represent the easiest way to cool a gas ?

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  17. A gas is liquified

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  18. Liquefaction of gases is based on the principle of

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  19. Critical temperature of H(2)O, NH(3), CO(2) and O(2) are 647 K, 405.6 ...

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  20. Consider the equation Z= (PV)/(RT). Which of the following statements ...

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