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NEET Sample Paper NEET Sample Test Paper-53

  • question_answer
    Two liquids A and B have \[{{P}_{A}}{}^\circ :{{P}_{B}}{}^\circ =1\,\,:\,\,3\] at a certain temperature. If the mole fraction ratio of \[{{x}_{A}}:{{x}_{B}}=\,\,1\,\,:\,\,3\], the mole fraction of A in vapour in equilibrium with the solution at a given temperature is-

    A) 0.1                   

    B)   0.2

    C) 0.5                               

    D) 1.0

    Correct Answer: A

    Solution :

    \[{{y}_{A}}\,=\,\frac{P_{A}^{0}{{X}_{A}}}{P_{A}^{0}{{X}_{A}}+P_{B}^{0}{{X}_{B}}}\] \[{{y}_{A}}\,=\,\frac{1}{1+\frac{P_{B}^{0}{{X}_{B}}}{P_{A}^{0}{{X}_{A}}}}\] \[{{y}_{A}}\,=\,\,\frac{1}{1+(3)(3)}=\frac{1}{10}\,\,=\,\,0.1\]


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