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Mass Transfer

Mass Transfer
The binary diffusivity in gases and liquids vary respectively as

T3/2 and √T
T and T3/2
T3/2 and T
√T and T3/2

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Mass Transfer
1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is

0.2
0.4
0.175
0.25

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Mass Transfer
Which of the following operations does not involve leaching?

Dissolving sugar from the cells of the beet
Dissolving pharmaceutical products from bark or roots
Removing nicotine from its water solution by kerosene
Dissolving gold from ores

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Mass Transfer
When the __________ the relative humidity of air decreases, despite an increase in the absolute humidity.

Temperature falls
Pressure rises
Temperature rises
Pressure falls

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Mass Transfer
In case of constant underflow extraction operation, the __________ at all solute concentration.

Neither A nor B
Ratio of the insoluble to solution is constant
Both A & B
Solids are drained to the same extent

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Mass Transfer
Rose oil is extracted from rose leaves using __________ distillation.

High pressure
Low pressure
Extractive
Steam

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