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

1. larger mean free path for X as compared to that of Y .
2. larger mean free path for Y as compared to that of X .
3. increased collision frequency of Y with the inert gas as compared to that of X with the inert gas.
4. increased collision frequency of X with the inert gas as compared to that of Y with the inert gas.

Correct answer: increased collision frequency of X with the inert gas as compared to that of Y with the inert gas.

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