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Question

Select the correct statements about van der Waals' constant $$'b'$$:
1. It is excluded volume.
2. It unit is mol $$litre^{-1}$$.
3. It depends on intermolecular force.
4. Its value depends on molecule size.


A
2,3
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B
1,2,4
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C
2,3,4
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D
3,4
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Solution

The correct option is B $$1, 2, 4$$
$$1)$$ $$(P+a\cfrac{n^2}{V^2})(V-nb)=nRT$$           here, $$V-nb$$ is excluded volume.
$$2)$$ $$V-nb\Longrightarrow nb=Lit\Longrightarrow b=Lit/mol$$
$$4)$$ Constant $$b$$ is correction of finite molecular size.

Chemistry

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