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Mass Transfer

Mass Transfer
In case of liquids, the binary diffusivity is proportional to (where, T = temperature)

T²
1/T
√T
T

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(De/t)1/2
(4De/πt)1/2
(4De/t)
(De.t)1/2

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Mass Transfer
HETP is numerically equal to HTU, only when the operating line

Lies above the equilibrium line
And equilibrium lines are parallel
Is far from the equilibrium line
Lies below the equilibrium line

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Mass Transfer
The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?

Interfacial
Liquid side
Gas side
Both liquid and gas side

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Mass Transfer
Chemisorption compared to physical absorption has

Lower capacity of the solvent for the solute gas
None of these
Increased utilisation of stagnant zones of the liquid phase
Lower adsorption rate

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Mass Transfer
Air at a particular humidity is heated in a furnace. The new dew point

Decreases
Remain unchanged
Depends on the extent of heating
Increases

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MORE MCQ ON Mass Transfer

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