The given graph represents the variation of Z (compressibility factor $=\frac{\mathrm{PV}}{\mathrm{nRT}}$ ) versus P , for three real gases $\mathrm{A}, \mathrm{B}$ and C . Identify the only incorrect statement.
Select the correct option:
A
For the gas $\mathrm{A}, \mathrm{a}=0$ and its dependence on P is linear at all pressure.
B
For the gas $\mathrm{B}, \mathrm{b}=0$ 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 $\mathrm{b}=0$. 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.
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