Q. The pressure and volume isotherm of a van der Waals’ gas, at the temperature at which it undergoes gas to liquid transition, is correctly represented by

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Solution:

van der Waals’ gases are thoses’ gases which shows positive or negative deviation from ideal gas equation. At constant temperature, the pressure of the van der Waals’ gas, which undergo gas to liquid transition is inversely proportional to its volume, i.e. as the volume increases pressure decreases.