Which of the following statement about Van der waal's equation i valid?
  • a)
    It is valid for all pressure and temperatures 
  • b)
    It represents a straight line on pv versus v plot
  • c)
    It has three roots of identical value at the critical point
  • d)
    The equation is valid for diatomic gases only.
Correct answer is option 'C'. Can you explain this answer?

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