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# Which of the following are correct statements ?van der Waals constant a is a measure of attractive forcevan der Waals constant b is also called co-volume or excluded volumeb is expressed in L mol−1a is expressed in atm L2mol−1

A
van der Waals constant b is also called co-volume or excluded volume
B
van der Waals constant a is a measure of attractive force
C
a is expressed in atm L2mol1
D
b is expressed in L mol1
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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