CBSE Class 11-science Answered
Which postulates of kinetic theory are not valid at high pressure and low temperature? Give reasons to justify their invalidity?
Asked by Topperlearning User | 21 Apr, 2015, 01:06: PM
Expert Answer
The postulates of the kinetic theory that are not valid at high pressure and low temperature are:
- There is no force of attraction between the molecules of a gas.
- Volume of the molecules of a gas is negligibly small in comparison to the space occupied by the gas.
According to the first assumption the gas will never liquefy but the gases do liquefy when cooled and compressed.
According to the second assumption the plot of P Vs V at constant temperature based on the experimental data and that based on theoretical calculations from Boyle’s law should coincide. But at high pressures deviations are observed which confirms that these postulates of the kinetic theory are invalid.
Answered by | 21 Apr, 2015, 03:06: PM
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