Chemistry - Ideal Gas Question with Solution | TestHub

(A) Average speed is proportional to $\sqrt{T/M}:He=\sqrt{100/4}=5$ and $C{H}_4=\sqrt{200/16}=3.5$. Not equal: false.

(B) $\lambda =kT/(\sqrt{2}\pi {\sigma }^{2}P)$ is proportional to T/P: (600/300)/(0.5/1) 2/0.5 = 4. True.

(C) $\sqrt{64/32}=1.41$, not 2: false.

(D) At constant P, N is proportional to 1/T, so collisions per molecule, proportional to $N\sqrt{T}$, is proportional to $1/\sqrt{T}$ and halves: false.

Answer: (B).