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JEE Main & Advanced Chemistry Solutions / विलयन Question Bank Lowering of vapour pressure

  • question_answer
    Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The parial vapour pressure of benzene at 20°C for a solution containing 78g of benzene and 46g of toluene in torr is           [AIEEE 2005]

    A)                 50          

    B)                 25

    C)                 37.5       

    D)                 53.5

    Correct Answer: A

    Solution :

                    PB = \[P_{B}^{o}{{X}_{B}}\] ;   \ \[{{P}_{B}}=\frac{\frac{78}{78}}{\frac{78}{78}+\frac{46}{92}}\times 75\] ; \    PB = 50 torr


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