Question

Positive deviation from ideal gas behavior takes place because of

• A. Molecular interaction and $\frac{PV}{nRT}>1$
• B. Molecular interaction and $\frac{PV}{nRT}<1$
• C. Finite atomic size and $\frac{PV}{nRT}>1$
• D. Finite atomic size and $\frac{PV}{nRT}<1$

Answer 1

The correct option is A Molecular interaction and $\frac{PV}{nRT}>1$

Molecular interaction is the main cause of positive deviation. In positive deviation Z > 1. Finite atomic size actually leads to Z < 1 since in case of finite atomic size V - b - V and this leads to Z = 1 - $\frac{a}{RTV}<1$