Which of the following pairs will effuse at the same rate through a porous plug .

Which of the following pairs will diffuse at the same rate through a porous plug ?

Which of the following pair will diffuse at the same rate?

In which of the following pairs the gaseous species diffuse through a porous plug with the same rate of diffusion -

Which of the following process makes the ore porous ?

Which of the following process makes the ore porous ?

Which of the following gases will have the same rate of effusion under identical conditions ?