For non-zero value of force of attraction between gas molecules of negligible volume, gas equation will be

Van der Waals equation for real gas is, $\left(\mathrm{P}+\frac{{\mathrm{n}}^2\mathrm{a}}{\mathrm{V}}\right)\left(\mathrm{V}-\mathrm{nb}\right)=\mathrm{nRT}$

For non zero forces of attraction between gas molecules and zero volume occupied by the gas molecules,
a≠0 and b=0
Hence, the Van der Waals equation will be,
$\mathrm{PV}=\mathrm{nRT}-\frac{{\mathrm{n}}^2\mathrm{a}}{\mathrm{V}}$