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A certain volume of Ar gas require 45 se...

A certain volume of Ar gas require 45 sec to effuse through a hole at a certain pressure and temperature. The same volume of another gas of unknown molecular weight require 60 sec to pass through the same hole under the same condition of temperature and pressure. The molecular weight of gas is

A

53u

B

35 u

C

71u

D

121 u

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