Component A is diffusing in a medium B The flux NA...

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Component A is diffusing in a medium B. The flux N_A relative to a stationary point is equal to the flux due to molecular difusion, if

A. Mass transfer is accompanied by reaction

B. Diffusion of A is in stagnant medium B

C. Molecular mean free path is high

D. There is equimolar counter diffusion

Answer: Option D

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