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The gas above T(c ) cannot be liquefied....

The gas above `T_(c )` cannot be liquefied.

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A gas can be liquefied

A gas can be liquefied

For every gas, there is a certain temperature above which it cannot be liquefied. It this statement correct ?

Temperature above which gas cannot be liquefied is called .........

The temperature above which the gas cannot be liquefied by any amount of pressure is called…………………...

Statement-1. Less is the critical temperature of a gas, more easily it can be liquefied. Statement-2. Critical temperature is the temperature above which a gas cannot be liquiefied applying any amount of pressure.

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 ?

CENGAGE CHEMISTRY-STATES OF MATTER-Exercises (Ture False)
  1. In the microscopic model of the gas, all the moleculer are supposed to...

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  2. For real gases, at high temperature Z = 0 small value of a means gas...

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  3. Small value of a means, gas can be easily liqueifed.

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  4. Rate of diffusion is directly proportional to the square root of molec...

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  5. For ideal gases, Z = 1 at all temperature and pressure.

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  6. According to charles's law,

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  7. The pressure of moist gas is higher than pressure of dry gas.

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  8. Gases do not occupy volume and do not have force of attraction.

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  9. The van der Waal equation of gas is (P + (n^(2)a)/(V^(2))) (V - nb)...

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  10. Surface tension and surface energy have different dimensions.

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  11. The plot of PV vs P at particular temperature is called isovbar.

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  12. Equal volume of all gases always contains equal number of moles.

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  13. A gas with a = 0 cannot be liquified.

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  14. The van der waals constants have same values for all the gases.

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  15. All the molecules in a given sample of gas move with same speed.

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  16. The observed pressure of real gas is more than the ideal pressure.

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  17. Heat capacity of a diatomic gas is higher than that of a monoatomic ga...

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  18. Dry O(2) is heavier than moist O(2).

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  19. The excluded volume (b) is = 4 (volume of one gas molecule)

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  20. The gas above T(c ) cannot be liquefied.

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