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Question

# Two gases A and B present separately in two vessels X and Y at the same temperature and pressure with molecular weights M and 2M respectively are effused out. The orifice in vessel X is circular while that in Y is a square. If the radius of the circular orifice is equal that the length of the square orifice the ratio of rates of effusion of gas A to that of gas B is:

A
π2
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B
π2
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C
2π
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D
2π
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Solution

## The correct option is A π√2rxry=√2MM×AxAy where Ax and Ay are the area of cross section of orifice.rxry=√2×πr2l2=π√2r=radius of a radius orificel= length of square orifice.Hence,option A is correct.

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