If  preal and  pideal  are the pressures of a gas calculated by using van der Waals and ideal gas equations, the condition at which preal >pideal  is 

  1. A

    a<RTb1nb/V

  2. B

    b<aRT+na/V

  3. C

    a<RTb1nb/V

  4. D

    b=aRT+na/V

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    Solution:

    If  preal and  pideal  are the pressures of a gas calculated by using van der Waals and ideal gas equations, the condition at which preal >pideal  is a<RTb1nb/V.

    The amount of the attraction between gas molecules is represented by the Van der Waal constant 'a,' and the effective volume of the gas molecules is represented by the Van der Waal constant 'b.

    Hence the correct option is A.

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