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Can you Answer Questions (TRUE , FALSE) please before 2 hours thx a- The Gradient of...

Can you Answer Questions (TRUE , FALSE) please before 2 hours thx
a- The Gradient of concentration at imperable surface equal to zero ?
b- the gradient of concentration at imperable surface equal to constant ?
c- Fick's Second law is used only in unsteady state mass transfer problems .
d- The Schmidt number relates to the thickness of hydrodynamic boundary layer to the thickness of concentration boundary layer ?

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