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 $\frac{PV}{nRT}>1$

The positive deviation from the ideal behavior shows that the repulsive force dominates over the attractive forces.

So, Molecular interaction is the main cause of positive deviation. In positive deviation Z > 1.
Compressibility factor, Z =$\frac{PV}{nRT}$
For positive deviation, it becomes $\frac{PV}{nRT}$>1, gas is less compressible