Question

# Which of the following are correct statements ?

A
van der Waals constant a is a measure of attractive force
B
van der Waals constant b is also called co-volume or excluded volume
C
b is expressed in L mol1
D
a is expressed in atm L2mol1
Solution
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#### Van der Waals constant a is a indirect measure of attractive force. Gases with higher values of a can be easily liquified.Van der Waals constant b is also called co-volume or excluded volume. It is the effective volume of a gas. When gas molecules have constant value of b over wider range of temperature and pressure, the gas molecules are incompressible.b has units L mol−1 or ml3 mol−1. The units of a are atm L2 mol−1.

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