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Critical constants are related with van ...

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 pressure required to liquefy a gas at the critical temperature is called :

A

reduced pressure

B

critical pressure

C

vapour pressure

D

atmospheric pressure

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The correct Answer is:
B
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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) . It 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 (Tc). The pressure required to liquefy a gas at this temperature is called the critical pressure (Pc). The volume occupied by one mole of the substance at the critical temperature and pressure is called critical 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 critical volumes of four gases A, B, C and D are 0.025L, 0.312L, 0.245L and 0.432L respectively. The gas with larger molecular diameter will be :

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AAKASH SERIES-STATES OF MATTER -LECTURE SHEET -EXERCISE-IV (VANDERWAAL.S EGN, CRITICAL CONSTANTS) (LINKED COMPREHENSION TYPE QUESTIONS) (PASSAGE-II)
  1. Critical constants are related with van der waals' constant as follows...

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  2. The essential conditions for liquefaction of gases were discovered by ...

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