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Assertion : Greater the value of van der Waals' constant ' $a$ ' greater is the liquefaction of gas. Reason : ' $a$ ' indirectly measures the magnitude of attractive forces between the molecules.
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If both assertion and reason are true and reason is the correct explanation of assertion.
Considering the attractive force pressure, the ideal gas equation $(P V=n R T)$ is corrected by introducing a factor of $\frac{a n^2}{V^2}$ where $a$ is van der Waals constant.
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