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An equation of state is explicit in pressure p and cubic in the specific volume v. At the critical point ‘c’ , the isotherm passing through ‘c’ satisfies

  1. $\frac{\partial p}{\partial v}$ < 0, $\frac{\partial^2 p}{\partial v^2}$ = 0
  2. $\frac{\partial p}{\partial v}$ > 0, $\frac{\partial^2 p}{\partial v^2}$ > 0
  3. $\frac{\partial p}{\partial v}$ = 0, $\frac{\partial^2 p}{\partial v^2}$ > 0
  4. $\frac{\partial p}{\partial v}$ = 0, $\frac{\partial^2 p}{\partial v^2}$ = 0
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