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A gas can be liquefied...

A gas can be liquefied

A

A gas can be liquified at any temp

B

above its critical temperature

C

below its critical temperature

D

at `0^(@) C`

Text Solution

Verified by Experts

The correct Answer is:
C
A gas can be liquified only when its temperature is below its critical temperature . This is because at critical temperature no distinction exists between the gaseous and liquid state and hence , no separate phase is formed .
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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) {:("Gases",A,B,C,D,),(P_(c) (atm),2.2,14,35,45,),(T_(c) (K),5.1,33,127,140,):} Which of the above gases cannot be liquefied at 100 K and 50 atm ?

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) The values of criticla volumes of four gases A, B, C and D are 0.025 L, 0.312 L, 0.245 L and 0.432 L respectively. The gas with larger diameter will be :

NARAYNA-STATES OF MATTER-EXERCISE - 3
  1. If a gas expands at constant temperature, it indicates that

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  2. A certain mass of the oxygen gas occupies 7 L volume under a pressure ...

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  3. A gas can be liquefied

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  4. The critical temperatures of O(2),N(2),H(2) and CO(2) are 154.3K,126K,...

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

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  6. The units of constants a in van der Waal's equation is

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  7. By the ideal gas law, the pressure of 0.60 mole NH3 gas in a 3.00 L v...

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  8. At identical temperature and pressure the rate of diffusion of hydroge...

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  9. Given: rms velocity of hydrogen at 300K is 1.9 xx 10^3 m/s. The rms ve...

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  10. At what temperature, the r.m.s. velocity of a gas measured at 50^(@)C ...

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  11. The Temperature at which 28 g of N(2) will occupy a volume of 10.0 L a...

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  12. A mixture of gases having different molecular weights is separated by ...

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  13. Which of the following expression is true regarding gas laws ? ( w = w...

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  14. What will be the partial pressures of He and O(2) respectively if 200 ...

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  15. A gaseous mixture was prepared by taking equal moles of CO and N(2). I...

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  16. By what factor does the average velocity of a gaseous molecule increas...

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  17. Two gases A and B having the same volume diffuse through a porous part...

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  18. What will happen to volume of a bubble of air found under water in a l...

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  19. A mixture contains 64 g of dioxygen and 60 g of neon at a total pressu...

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  20. Choose the incorrect statement in the following .

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