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Q.

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

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a

2 : 1

b

1 : 2

c

1 : 4

d

4 : 1

answer is B.

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Detailed Solution

Ratio of rates of diffusion of He & CH4 = 2 : 1let total moles diffused = 2+1 =3Moles of He present = 3 - 2 = 1Moles of CH4 present =3 -1 = 2Ratio = 1:2

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