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NEET Sample Paper NEET Sample Test Paper-85

  • question_answer
    At a particular temperature, the vapour pressures of two liquids A and B are respectively 120 and 180 mm of mercury. If 2 moles of A and 3 moles of B are mixed to form an ideal solution, the vapour pressure of the solution at the same temperature will be (in mm of mercury)

    A) 156      

    B)                    145  

    C) 150                  

    D)        108

    Correct Answer: A

    Solution :

    [a] Vapour pressure of solution \[={{P}_{A}}+{{P}_{B}}=P_{A}^{o}{{x}_{A}}+P_{B}^{o}{{x}_{B}}\] \[=\frac{120\times 2}{5}+\frac{180\times 3}{5}=156\,\,mm\]


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