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(B) In an Andrews isotherm diagram for a real gas,the critical temperature is defined as the temperature at which the horizontal portion of the isothe

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${T_2}$

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(B) In an Andrews isotherm diagram for a real gas,the critical temperature is defined as the temperature at which the horizontal portion of the isotherm (representing the phase transition from gas to liquid) reduces to a single point of inflection.Looking at the provided $P-V$ curves:- At temperatures ${T_4}$ and ${T_3}$,there is a distinct horizontal region indicating the coexistence of liquid and gas phases.- At temperature ${T_2}$,the horizontal region has shrunk to a point of inflection,which is the characteristic feature of the critical isotherm.- At temperature ${T_1}$,the curve is smooth and does not show any phase transition,indicating it is above the critical temperature.Therefore,the critical temperature of the gas is ${T_2}$.

The change in volume $V$ with respect to an increase in pressure $P$ has been shown in the figure for a non-ideal gas at four different temperatures ${T_1}, {T_2}, {T_3}$ and ${T_4}$. The critical temperature of the gas is

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