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Mass Transfer

Mass Transfer
Ion exchange process is similar to

Adsorption
Leaching
Absorption
Extraction

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the temperature (T) as

D ∝ T2
D ∝ T1.5
D ∝ T0.5
D ∝ T

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Mass Transfer
At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.

100
Between 0 and 100
50

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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)

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

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

High maintenance cost
All of the listed here
High labour cost & low heat economy
Non-uniform & low production rate

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Mass Transfer
Leaching of coffee from coffee beans is done by

Hexane
Dilute H₂SO₄ (hot)
Hot water
Lime water

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