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The temperature above which a gas cannot...

The temperature above which a gas cannot be liquified even on application of high pressure is called 

A

boiling point

B

freezing point

C

critical temperature

D

Boyle's temperature

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To solve the question about the temperature above which a gas cannot be liquefied even on application of high pressure, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Concept of Liquefaction**: - Liquefaction of gases typically requires low temperatures and high pressures. At low temperatures, gas molecules have less kinetic energy, allowing them to come closer together and form a liquid. 2. **Identifying the Key Temperature**: - There exists a specific temperature known as the **critical temperature**. This is the temperature above which a gas cannot be converted into a liquid, regardless of the pressure applied. 3. **Defining Critical Temperature**: - The critical temperature is defined as the maximum temperature at which a substance can exist as a liquid. Above this temperature, no amount of pressure can force the gas into a liquid state. 4. **Conclusion**: - Therefore, the answer to the question is that the temperature above which a gas cannot be liquefied even on application of high pressure is called the **critical temperature**. ### Final Answer: The temperature above which a gas cannot be liquefied even on application of high pressure is called **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) . 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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