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A type tube with a pin hole is first fil...

A type tube with a pin hole is first filled with oxygen to a pressure of 30 Ib/sq inch and allowed to leak out. Then it is filled with `N_(2)` gas to the same pressure and allowed to leak out again. In which case, the time taken will be more and why ?

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The time taken will be more in case the type tube is filled with `O_(2)`. This is because `O_(2)` has higher molar mass than `N_(2)` and rate of effusion is inversely proportional to the square root of molar mass
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