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Mass Transfer

Mass Transfer
Rate of leaching increases with increasing

Temperature
Size of the solid
Pressure
Viscosity of solvent

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Mass Transfer
Separation of __________ employs gaseous diffusion process.

Isotopes of uranium
N₂ and O₂ from air
Isotopes of helium
SO₂ and air

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Mass Transfer
If f = moles of vapour present per mole of feed, then the slope of feed line is

(1 - f)/f
- 1/f
- f/(1 - f)
- (f - 1)/f

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Mass Transfer
Weeping in a distillation column

Results due to very high gas velocity
Provides large interfacial surface for mass transfer
Increases tray efficiency
Results due to very low gas velocity

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Mass Transfer
Large scale usage of flash distillation is practised in

Soap manufacturing
Ammonia synthesis plant
Polymerisation industry
Petroleum refinning

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Mass Transfer
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.

Relative humidity
Wet bulb temperature
None of these
Partial pressure of water vapor

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