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Mass Transfer

Mass Transfer
Leaching of sugar from sugar beets is done by

Hot water
Hexane
Dilute H₂SO₄
Lime water

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Mass Transfer
Physical absorption is

An irreversible phenomenon
Accompanied by evolution of heat
Both B & C
A reversible phenomenon

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Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/ky.Cz is around

0.72
0.24
1
0.6

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Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

1.04
0.54
1.24
1.94

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Mass Transfer
The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line)

G/mL
LG/m
L/mG
ML/G

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Mass Transfer
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

Higher wet bulb temperature
Higher dew point
Higher absolute (specific) humidity
Higher relative humidity

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