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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2009

  • question_answer
    Vapour pressure of pure ?A? is 70 mm of Hg at\[{{25}^{o}}C\]. It forms an ideal solution with ?B? in which mole fraction of A is 0.8. If the vapour pressure of the solution is 84 mm of Hg at\[{{25}^{o}}C\], the vapour pressure of pure ?B? at \[{{25}^{o}}C\] is

    A)  28 mm                

    B)  56 mm

    C)  70mm                                 

    D)  140mm

    Correct Answer: D

    Solution :

    \[p=p_{A}^{o}{{x}_{A}}+p_{B}^{o}{{x}_{B}}\] \[\Rightarrow \]               \[84=70\times 0.8+p_{B}^{o}\times 0.2\]                 \[84=56+p_{B}^{o}\times 0.2\]                 \[p_{B}^{o}=\frac{28}{0.2}=140\,\,mm\]


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