Question

Select the correct statements about van der Waals' constant ${}^{\prime }{b}^{\prime }$:
1. It is excluded volume.
2. It unit is mol $litr{e}^{-1}$.
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. $3,4$

Answer 1

The correct option is B $1,2,4$

$1)$ $(P+a\frac{n^2}{V^2})(V-nb)=nRT$ here, $V-nb$ is excluded volume.

$2)$ $V-nb⟹nb=Lit⟹b=Lit/mol$

$4)$ Constant $b$ is correction of finite molecular size.