Unit of molal diffusivity is

A. cm²/sec gm.mole

B. gm moles/cm².sec

C. gm moles/cm.sec

D. gm moles/cm³.sec

Answer: Option A

Solution(By Examveda Team)

Molal diffusivity (D_m) is a measure of how quickly a substance diffuses through a solvent when there is a concentration gradient between them.

The unit of molal diffusivity is typically expressed in terms of square centimeters per second (cm²/s) multiplied by the number of grams (gm) of the solute per mole (mole) of the solute.

So, the correct unit for molal diffusivity is cm²/sec gm.mole, which corresponds to option A.