Question

A real gas obeying van der Waals equation will resemble ideal gas, if the :

• A. constants a and b are small
• B. a is large and b is small
• C. a is small and b is large
• D. constant a and b are large

Answer 1

The correct option is A constants a and b are small

A real gas obeying Vander Waals equation will resemble ideal gas, if the constants a & b are small.
The constants a and b represent pressure correction and the volume correction respectively.
When a and b are small, the terms $\frac{a{n}^2}{V^2}$ and $nb$ can be neglected in the van der waals equation and the equation reduces to the ideal gas equation.