Q78 · CSIR-NET Chemistry, June 2017

Paper: CSIR-NET June 2017 · Subject: Physical Chemistry · Chapter: Thermodynamics · Topic: Thermodynamics – General · Marks: 2 · Difficulty: Medium

The fugacity of a real gas is less than the pressure ( P ) of an ideal gas at the same temperature (T) only when ( $\mathrm{T}_{\mathrm{b}}$ is the Boyle temperature of the real gas)
(a)high $\mathrm{P}, \mathrm{T}<\mathrm{T}_{\mathrm{b}}$
(b)low P, T $<\mathrm{T}_{\mathrm{b}}$
(c)high $\mathrm{P}, \mathrm{T}>\mathrm{T}_{\mathrm{b}}$
(d)low P, T $>\mathrm{T}_{\mathrm{b}}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
f < p requires Z < 1, i.e. attractions dominating: low pressure and T below the Boyle temperature.

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