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Mass Transfer

Mass Transfer
Prandtl number for water at 20°C is about

70
7
150
0.7

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Mass Transfer
Steam distillation is used to separate

Azeotropes
High boiling substances from nonvolatile impurities
Heat sensitive materials
Mixtures of low relative volatility

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Mass Transfer
The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the

Heat of wetting
Differential heat of adsorption
Integral heat of adsorption
None of these

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

Increased diffusivity
None of the listed here
Both Decreased viscosity of liquid & Increased diffusivity
Decreased viscosity of liquid

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Mass Transfer
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

0.001
9.21
4.605
100

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Mass Transfer
Radioactive nuclear waste is treated in

Bollman extractor
Pulsed column extractor
Mixer-settler extractor
Rotating-disc contactor

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