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Mass Transfer

Mass Transfer
Molarity is defined as the number of gm moles of solute per __________ of solvent.

Kg
c
Gm
Litre

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Mass Transfer
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)

10
6.89
8.89
8.25

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Mass Transfer
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

√T
T1.5
T
T3

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Mass Transfer
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.

Critical
Free
Bound
Unbound

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Mass Transfer
With increase in temperature, the rate of leaching increases, because the

None of these
Thermal conductivity of solute increases
Viscosity of solvent decreases
Diffusivity of solute increases

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Mass Transfer
Extraction of coffee from its seed is done by

Leaching
Liquid-liquid extraction
Extractive distillation
Steam distillation

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