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A gas X diffuses three times faster than...

A gas X diffuses three times faster than another gas Y, the ratio of their densities i.e., `D_(x) : D_(y)` is

A

`(1)/( 3)`

B

`( 1)/( 9)`

C

`(1)/( 6)`

D

`( 1)/( 12)`

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The correct Answer is:
B
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