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NEST2020ChemistryStates of Matter

Consider one mole of a gas in a closed vessel fitted with a movable piston. At constant temperature ( T ), the pressure of the gas (P) is increased gradually and the volume (V) is noted. The resulting P - V isotherm (not drawn to scale) is given below. The correct plot (not drawn to scale) of the number of moles of the substance in gas phase ( n G ) against V or P is:

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