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NEET Sample Paper NEET Sample Test Paper-70

  • question_answer
    The vapour pressure of solvent is 20 torr, while that of its dilute solution is 17 torr, the mole fraction of the solvent is

    A) 0.6                              

    B) 0.4

    C) 0.5                              

    D) 0.7

    Correct Answer: B

    Solution :

    From question \[P{}^\circ =20\,torr,\,\,{{P}_{S}}=17\,torr\] \[\frac{P{}^\circ -{{P}_{s}}}{{{p}^{o}}}=X\,\,solute\] \[\frac{3}{20}=X\,\,solute\] or         \[X\,solute\,\,=\,\,0.6\] \[X\,solvent\,\,=\,\,0.4\]


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