The compressibility factor of a gas at a given temperature falls from 1 to a minimum of $0.80$ as pressure increases, then rises. The pressure at which $Z = 1$ again corresponds to

Athe critical pressure
Bthe pressure at which attractive and repulsive corrections exactly cancel
Cthe Boyle pressure, which is independent of $T$
Dzero pressure

Answer: B

Z

returns to 1 when the lowering of pressure by attraction is just compensated by the raising of effective pressure by excluded volume. This crossing pressure depends on temperature and is not related to the critical pressure.

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The compressibility factor of a gas at a given temperature falls from 1 to a minimum of 0.80 as pressure increases, then rises. The pressure at which Z=1 again corresponds to

Answer: B

More questions on Deviation from ideal behaviour and compressibility factor

The compressibility factor of a gas at a given temperature falls from 1 to a minimum of $0.80$ as pressure increases, then rises. The pressure at which $Z = 1$ again corresponds to