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A vessel contains equal number of moles ...

A vessel contains equal number of moles of helium and methane. Through a small orifice the half of gas effused out. The ratio of the number of mole of helium and methane remaining in the vessel is

A

`2 :1`

B

`1:2`

C

`1:4`

D

`4:1`

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The correct Answer is:
B
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