Question

Which of the following pairof gases cannot be separated by diffusion method? & why?
A) SO₂ and H₂ B) CO₂ and NO₂ C) NH₃ & N₂ D) CO₂ & H₂

Answer 1

Dear Student,
Those gases can be separated by diffusion which have large difference in molecular weights because according to graham's law of diffusion , the rate of diffusion of any gas depends on its molecular mass.
The pair of gases give in option (b) CO₂ and NO₂ have nearly same molecular weights hence they cannot be separated by diffusion.
Regards!