Which of the following is true at the critical point ?

Which of the following is true at the critical point ?

  1. A

    At the critical point three roots of van der Waals equation are equal

  2. B

    Below the critical point two roots of the van der Waals equation are equal and imaginary but one root is real

  3. C

    Above the critical point density of gas is greater than density of liquid

  4. D

    Above the critical point three roots of van der Waals equation are real but unequal 

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    Solution:

    At the critical point three roots of van der Waals equation are equal.

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