Which of the following are correct statements? (a) van der Waals constant \( \mathrm{a} \) is ...

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Which of the following are correct statements?
(a) van der Waals constant \( \mathrm{a} \) is a measure of attractive force.
(b) van der Waals constant \( \mathrm{b} \) is also called co-volume or excluded volume.
(c) \( \mathrm{b} \) is expressed in \( \mathrm{L} \mathrm{mol}^{-1} \).
(d) b is one-third of critical volume.
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