QuestionKinetic theory / mean free path
Which one among the following gases has the largest mean free path under the same external conditions?
- (a) H₂
- (b) Cl₂
- (c) N₂
- (d) O₂
Answer: (a) H₂
λ = kT/(√2 π d² P). At same T and P, λ ∝ 1/d². H₂ has the smallest molecular diameter → largest mean free path → (a).