JEE Main & Advanced Chemistry States of Matter Question Bank Ideal gas equation and Related gas laws

  • question_answer The ratio of the rate of diffusion of a given element to that of helium is 1.4. The molecular weight of the element is [Kerala PMT 1990]

    A)                 2             

    B)                 4

    C)                 8             

    D)                 16

    Correct Answer: A

    Solution :

               \[\frac{{{r}_{g}}}{{{r}_{He}}}=\sqrt{\frac{{{M}_{He}}}{{{M}_{g}}}}\therefore {{M}_{g}}={{M}_{He}}.\frac{{{r}^{2}}_{He}}{{{r}^{2}}_{g}}=\frac{4}{{{(1.4)}^{2}}}=\frac{4}{1.96}=2\]                                 \[\left[ Note:1.4=\sqrt{2} \right]\]


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