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Dalton's Law of Partial Pressures

The ratio of ...

Question

The ratio of the rates of diffusion of two gases with molecular weights 100 and 81 is:

A

9 : 10

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B

10 : 9

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C

100:81

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D

81:100

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Solution

The correct option is A 9 : 10
$\frac{r_{1}}{r_{2}} = \sqrt{\frac{M_{2}}{M_{1}}}$

$\frac{r_{1}}{r_{2}} = \sqrt{\frac{81}{100}} = \frac{9}{10}$

Option A is correct.

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