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Question

If gas A diffuses 9 times faster than B, then the ratio of the densities of A and B is ...........

A
9 : 1
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B
1 : 9
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C
81 : 1
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D
1 : 81
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Solution

The correct option is D 1 : 81
According to Graham's law of diffusion; r1r2αd2d1
Given that r1 = 9r2
Therefore 9r2r2αd2d1
d2d1=811
Therefore d1 : d2 = 1 : 81

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