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Question

Which of the following are correct statements ?


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

The correct options are
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 $$L\ mol^{-1}$$
D $$a$$ is expressed in $$atm\ L^{2} mol^{-1}$$
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 $$ml^3\ mol^{-1}$$.
The units of $$a$$ are $$atm\ L^{2} \ mol^{-1}$$.

Chemistry

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