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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

1
> 10
1 to 5
5 to 10

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Mass Transfer
When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.

Always higher than
Same as
Always lower than
Dependent on the system; can be either lower or higher than

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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

0.4
0.2
0.25
0.175

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Mass Transfer
Leaching rate is independent of the

Agitation
None of the listed here
Particle size
Temperature

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Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

1.5
-1.5
0.6
-0.6

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Mass Transfer
For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams

Remains unaffected
Increases
Decreases
Passes through a maximum

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