Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

D/a
Dependent on the Reynolds number
Proportional to √D
D/2a

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Mass Transfer
In saturated gas, the

None of the listed here
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
Vapour is in equilibrium with the liquid at the gas temperature
Vapour is in equilibrium with the liquid at the room temperature

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Mass Transfer
Pick out the wrong statement pertaining to leaching.

Very high temperature is not needed for the leaching of sugar beet
Fine solids can not be leached in a Pachuka tank
Vegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor
Door classifier can be used for leaching of coarse solids

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