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JEE Main & Advanced Sample Paper JEE Main Sample Paper-43

  • question_answer
    At \[25{}^\circ C\] the vapour pressure of pure liquid A (mol. wt. = 40) is 100 torr and that of pure liquid B (mol. wt. =80) is 60 torr. Find the vapour pressure of solution at \[25{}^\circ C\] if the mole ratio of A and B in vapour phase is 2 : 3.

    A)  60.3 torr                     

    B)  65.7 torr

    C)  71.42 ton-                  

    D)  None of these

    Correct Answer: C

    Solution :

                \[e=-\frac{\Delta \phi }{\Delta t}\] \[=\frac{0.25\times {{10}^{-3}}Wb}{0.05\,s}=5\times {{10}^{-3}}V\] \[=100\,\left( \frac{\Delta \phi }{\Delta t} \right)\]


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