van der Waal equation is true for :

Options

A. both `((delP)/(delV))_(T)`and `((del^(2)P)/(delV^(2)))_(T)`are zero
B. only `((del^(2)P)/(delV^(2)))_(T)` is not zero
C. `((delP)/(delV))_(T)` is zero but `((del^(2)P)/(delV^(2)))_(T)` is non-zero
D. `((delP)/(delV))_(T)` is non-zero but `((del^(2)P)/(delV^(2)))_(T)` is zero

Answer

a

Explanation

(a) At critical temperature slope of pressure volume curve is maximum and it is zero.