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BHU PMT BHU PMT Solved Paper-2003

  • question_answer
    Ratio of molecular weights of A and B is \[\frac{4}{25}\] then ratio of rates of diffusion will be:

    A)  5 : 1                                      

    B)  5 : 2

    C)  25 : 3                                    

    D)  25 : 4

    Correct Answer: B

    Solution :

                     Key Idea: The problem can be solved with the help of Graham's rule. The formula to be used is as follows: \[\frac{{{r}_{1}}}{{{r}_{2}}}=\sqrt{\frac{{{M}_{2}}}{{{M}_{1}}}}\] Given, \[{{M}_{1}}=4,{{M}_{2}}=25\] Substituting values,                 \[\frac{{{r}_{1}}}{{{r}_{2}}}=\sqrt{\frac{25}{4}}=\frac{5}{2}\] \[\therefore \]Ratio of rate of diffusion = 5 : 2


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