The pressure (p) and volume (V) isotherm of a | vedclass

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(B) The van der Waals' equation of state for a real gas is given by $(p + \frac{an^2}{V^2})(V - nb) = nRT$. For a fixed amount of gas at a constant te

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(B) The van der Waals' equation of state for a real gas is given by $(p + \frac{an^2}{V^2})(V - nb) = nRT$. For a fixed amount of gas at a constant temperature,the $p-V$ isotherm below the critical temperature exhibits a characteristic '$S$' shape,which represents the region of gas-liquid coexistence. In this region,the pressure remains constant as the volume changes during the phase transition. The curve shown in option $(b)$ correctly depicts this behavior,showing the characteristic inflection point and the region of phase transition for a van der Waals' gas.

The pressure $(p)$ and volume $(V)$ 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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