Which Of The Following Gas Molecule Has The Longest Mean Free Path At The Same Pressure And Temperature? (A) Cl2.(B) H2.(C) N2.(D) O2.

The correct answer is (B) H2.

Mean free path refers to the average distance travelled by a moving particle between successive collisions.

The smaller the molar mass, the higher the mean free path. Therefore, hydrogen (H) has the smallest molar mass. Hence, it has the largest mean free path.

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