The behaviour of a real gas is usually depicted by plotting…

Chemistry Gaseous State ( Not In Syllabus ) General Single Correct MCQ

Published on: August 14, 2026

The behaviour of a real gas is usually depicted by plotting compressibility factor Z versus P at a constant temperature. At high temperature and high pressure, Z is usually more than one. This fact can be explained by van der Waals equation when

The constant ‘a’ is negligible and not ‘b’

The constant ‘b’ is negligible and not ‘a’

Both constants ‘a’ and ‘b’ are negligible

Both the constants ‘a’ and ‘b’ are not negligible.

Text Solution

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The correct answer is:

(V – nb) = nRT

At low pressures, ‘b’ can be ignored as the volume of the gas is very high. At high temperatures ‘a’ can be ignored as the pressure of the gas is high.

∴ ∴ P (V–b) = RT

PV - Pb = RT

PV = RT + Pb

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