Discussion
Assertion (A): Van der Waals parameters can be obtained from critical constants alone.
Reason (R): The critical isotherm has both a zero first derivative and a zero second derivative at the critical point.
Answer: C
Both are true and the reason gives the method: two conditions on the same isotherm give two equations, which is exactly enough to fix the two parameters without any further data. Critical temperature and pressure are tabulated for most fluids.
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