Question

The experimental value of $d$ is found to be smaller than the estimated value obtained using Graham's law. This is due to:

• A. larger mean free path for $X$ as compared to that of $Y$
• B. larger mean free path for $Y$ as compared to that of $X$
• C. increased collision frequency of $Y$ with the inert gas as compared to that of $X$ with the inert gas
• D. increased collision frequency of $X$ with the inert gas as compared to that of $Y$ with the inert gas

Answer 1

The correct option is C increased collision frequency of $Y$ with the inert gas as compared to that of $X$ with the inert gas

The experimental value of $d$ is found to smaller than the estimated value obtained using Graham's law.

This is due to increased collision frequency of $Y$ with the inert gas as compared to that of $X$ with the inert gas. $(\because$ As, the collision frequency increases, the molecular speed decreases much more than expected.)