Which of the following will have the slowest rate of diffusion at a given temperature? 1) o2 2) ne 3) cl2 4) he

According to Graham's law of diffusion, rate of diffusion/effusion is inversely proportional to the square of the molar mass, so greater the molar mass will be, smaller will be the rate.

Here, Cl2 has greatest molar mass, so it will diffuse slowest among all.

In short, Your Answer would be Option 3

Hope this helps!

The correct answer is 3: Cl2. The answer be determined because the substance with the heaviest atomic weight has the slowest rate of diffusion. A substance that has less atomic rate would have a higher rate of diffusion.