JEE Main · 2004 · 24 Apr 2004 · Offline · States of Matter

In Vander Waals equation of state of the gas law, the constant 'b' is a measure of

(A)intermolecular repulsions
(B)intermolecular collisions per unit volume
(C)Volume occupied by the molecules✓ Correct
(D)intermolecular attraction

Answer: (C)

Solution

In the van der Waals equation

(P + \frac{a n ^{2}}{V ^{2}}) (V - nb) = n R T

, the constant

b

is subtracted from the volume as a correction for the room the molecules themselves take up. It stands for the excluded, or effective, volume of the molecules, which is not available for free motion. It is the other constant,

a

, that accounts for intermolecular attraction.

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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