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Mass Transfer

Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

10-5 to 10-6
0.01
0.1
> 1

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

(G.a)/FG
FG/(G.a)
F/(FG.a)
L/(FG.G)

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Mass Transfer
The unit of volumetric diffusivity is

Cm²/sec
Cm²/seC₂
Cm/sec
Cm³/sec

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Mass Transfer
The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called

None of these
Decoction
Elutriation or elution
Percolation

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Mass Transfer
The Kundsen diffusivity is proportional to (where, T = absolute temperature)

T²
T
T⁴
√T

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Mass Transfer
The adiabatic saturation curve for a vapour-gas mixture is

Slightly concave downward
None of these
Straight line
Slightly concave upward

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