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NEET Sample Paper NEET Sample Test Paper-92

  • question_answer
    Which of the following is an expression of Raoults law if \[{{P}_{A}}\] is the partial pressure of the solvent in a solution. \[{{P}^{0}}_{A}\] is the partial pressure of pure solvent and if \[{{X}_{A}}\] and \[{{X}_{B}}\] are the mole fraction of the solute and the solvent respectively?

    A) \[{{P}_{A}}=P_{A}^{O}{{x}_{A}}\] 

    B)        \[{{P}_{A}}=P_{A}^{O}{{x}_{A}}\left( \frac{1}{{{x}_{B}}} \right)\]

    C) \[{{P}_{A}}=P_{A}^{O}{{x}_{B}}\] 

    D)        \[P_{A}^{O}=P\left( \frac{{{x}_{A}}}{{{x}_{B}}} \right)\]

    Correct Answer: C

    Solution :

    [c]  According to Raoult's law \[{{P}_{A}}=P{{{}^\circ }_{A}}\times {{x}_{B}}\] (partial pressure of solvent is equal to pure pressure of solvent multiplied by mole fraction of solvent.


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