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Two gases A and B having the same volume...

Two gases `A` and `B` having the same volume diffuse through a porous partition in `20` and `10` seconds respectively. The molar mass of `A` is `49 u`. Molar mass of `B` will be

A

`25.00u`

B

`50.00 u`

C

`12.25 u`

D

`6.50 u`.

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