Chemistry - Ideal Gas Question with Solution | TestHub

Wall collisions per unit time ∝ N^*,u_av (for the walls, 1/4N^*u_avA). (a) True: raising T raises u_av at fixed N^*. (b) False: adding CO₂ at constant T and volume leaves the Ar number density and Ar mean speed unchanged, so the Ar wall-collision rate is unchanged, not decreased. (c) False, by the same reasoning. (d) False: lowering the average kinetic energy per molecule lowers T and hence u_av, so the collision rate decreases rather than remaining unchanged. Hence (a).