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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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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:

A2Z-STATES OF MATTER-Section D - Chapter End Test
  1. A gas can be liquefied by pressure alone when its temperature

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  2. Boyle's law may be experssed as .

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  3. A vessel has N(2) gas and water vapours at a total pressure of 1 atm. ...

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  4. For two gases A and B with molecular weights M(A) and M(B), respective...

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  5. The circulation of blood in human body supplies O(2) and releases CO(2...

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  6. At 100^(@)C and 1 atm, if the density of the liquid water is 1.0 g cm^...

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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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  11. The ratio between the root mean square speed of H(2) at 50 K and that ...

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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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  15. XmL of H(2) gas effuses through a hole in a container is 5 second. The...

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  16. NH(3) is liquefied more easily than N(2). Hence

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  17. 0.2 mole sample of hydrocarbon C(x)H(y) yields after complete combusti...

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  18. When 2 g of a gas A is introduced into an evacuated flask kept at 25^(...

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  19. Air open vessel at 127^(@)C is heated until 1//5^(th) of air in it has...

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  20. 3.2 g of S is heated to occupy a volume of 780 ml at 450^(@)C and 723 ...

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