Question

The given graph represent the variations of $Z$ (compressibility factor (Z)$=\frac{pV}{nRT}$ versus $p$ , for three real gases $A,B$ and $C$. Identify the only incorrect statement.

• A. For the gas $A,a=0$ and its dependence on $p$ is linear at all pressure
• B. For the gas $B,b=0$ and its dependence on $p$ is linear at all pressure
• C. For the gas $C$, which is typical real gas for which neither a nor $b=0$ . By knowing the minima and the point of intersection, with $Z=1,a$ and $b$ can be calculated
• D. At high pressure, the slope is positive for all real gases

Answer 1

Answer: (B)

Option (b) is incorrect statement because at high pressure slope of the line will change from negative to positive.