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JEE Main & Advanced Sample Paper JEE Main Sample Paper-44

  • question_answer
    An ideal solution contains two volatile liquids \[A({{p}^{o}}=100\,\,torr)\]and \[B({{p}^{o}}=200\,\,torr)\]. If mixture contains 1 mole of A and 4 moles of B, then total vapour pressure of the distillate is

    A)  150 torr                      

    B)  180 torr          

    C)  188.88 torr                 

    D)  198.88 torr

    Correct Answer: C

    Solution :

            \[{{p}_{Total}}=p_{A}^{o}{{X}_{A}}+p_{B}^{o}{{X}_{B}}\] \[=1000\times \frac{1}{5}+200\times \frac{4}{5}\] \[=20+160=180\] \[\therefore \]    \[{{p}_{distillate}}=100\times \frac{20}{180}+200\times \frac{160}{180}\]= 188.88 torr


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