Chemistry - Ideal Gas Question with Solution | TestHub

At constant P, V ∝ T, so the number density N^* = N/V falls as 1/T. Mean free path λ = 1/(√(2)),πσ² N^* therefore grows ∝ T — (c) true. Collision frequency of a molecule z ∝ u_avN^* ∝ √(T)/T = 1/√(T) decreases; collision number per unit volume ∝ (N^*)² u_av also decreases; and N^* itself decreases, ruling out (a), (b), (d). Confirms Ans (c).