0.48 g of a volatile substance upon vapo...

0.48 g of a volatile substance upon vapourisation gives 112 ml vapours at STP. Ratio of rate of diffusion of vapours of volatile substance to `H_2(g)` is (assume vapours behave ideally)

A

`1`/`sqrt(12)`

B

`1`/`sqrt(48)`

C

`1`/`sqrt(18)`

D

`1`/`sqrt(72)`

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