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CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2003

  • question_answer
    The van der Waals equation for a real gas is given by the formula\[\left( P+\frac{{{n}^{2}}a}{{{V}^{2}}} \right)\]\[(V-nb)=\]\[nRT,\]where\[P,V,T\]and\[n\]are the pressure, volume, temperature and the number of moles of the gas. Which one is the correct interpretation for the parameter a?

    A)  The parameter a accounts for the finite size of the molecule, not included temperature in the ideal gas law

    B)  The parameter a accounts for the shape of gas phase molecules

    C)  The   parameter   a   accounts   for intermolecular interactions present in the molecule

    D)  The parameter a has no physical significance and van der Waals introduced it as a numerical correction factor only

    E)  The parameter is a correction factor to the volume of the container

    Correct Answer: C

    Solution :

    In van der Waals equation \[\left[ P+\frac{{{n}^{2}}a}{{{V}^{2}}} \right](V-nb)=nRT\] Where, P = pressure, V = volume T = temperature, n = moles of the gas and parameter d accounts for intermolecular inter-actions present in the molecule.


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