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

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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