Which of the following gas molecule has the longest mean free path at the same pressure and temperature?

H_{2}

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N_{2}

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O_{2}

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{C l}_{2}

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Solution

The correct option is C $H_{2}$
Mean free path is the average distance travelled by a moving particle between successive collisions. Mean free path is inversely proportional to molar mass. So, smaller the molar mass, higher the mean free path.
So as hydrogen has the smallest molar mass, so it has the largest mean free path.

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