The rate of diffusion of hydrogen is about:

The correct answer is option B i.e. rate of diffusion of H₂ is 1.4 times that of He, which can be explained on the basis of Graham's law of diffusion.

Acc to Graham's law of diffusion,

Rate is proportional to inverse of root of molar mass.

So, ratio of rates of diffusion of H₂  and He can be written as: 

The correct answer is option B i.e. rate of diffusion of H₂ is 1.4 times that of He, which can be explained on the basis of Graham's law of diffusion.

Acc to Graham's law of diffusion,

 Rate is proportional to inverse of root of molar mass.

So, ratio of rates of diffusion of H₂  and He can be written as: R_H2 /R_He = √(M_He/M_H2)

=√(4/2) = 1.414

Hence, the correct answer is ROD of H₂ is 1.4 times that of He i.e. option B