Which of the following statements regarding compressibility factor are correct?

A $Z = V_{real} / V_{ideal}$ at the same $T$ , $P$ and $n$
BFor $H X_{2}$ at $273 K$ , $Z$ increases steadily with pressure from the value 1
CA gas with $Z$ less than 1 has a molar volume larger than the ideal value
DAt the Boyle temperature $Z$ is close to 1 over a range of low pressures

Answer: A, B, D

Z = P V_{real} / n RT = V_{real} / V_{ideal}

(A true). Hydrogen at

273 K

is above its Boyle temperature (about

110 K

), so repulsion dominates and

Z

rises from 1 (B true).

Z

less than 1 means a smaller molar volume, not larger (C false). The Boyle temperature is defined by near-ideal behaviour over a range of low pressures (D true).

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Which of the following statements regarding compressibility factor are correct?

Answer: A, B, D

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