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The densities of two gasses are in the ratio of 1: 16. The ratio of their rates of diffusion is

a) 16:1
b) 4:1
c) 1:4
d) 1:16

Answer: b
Explanation: \[\frac{r_{1}}{r_{2}}= \sqrt{\frac{d_{2}}{d_{1}}} = \sqrt{\frac{16}{1}} = 4:1\]

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