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Q.

A certain volume of argon gas (Mol. Wt. = 40) requires 45 s to effuse through a hole at a certain pressure and temperature. The same volume of another gas of unknown molecular weight requires 60 s to pass through the same hole under the same conditions of temperature and pressure. The molecular weight of the gas is :

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a

53

b

120

c

35

d

71

answer is C.

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Detailed Solution

According to Graham's law,

As we know,

6045=M40; M=71

Hence, the correct option is C

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