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Mass Transfer

Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

99
90
95
91.5

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(4De/t)
(De/t)1/2
(4De/πt)1/2
(De.t)1/2

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Mass Transfer
The Schmidt number which is defined as, μ/ρ D, is the ratio of the

Momentum diffusivity to the mass dif-fusivity
None of these
Momentum diffusivity to the thermal diffusivity
Thermal diffusivity to the mass diffusivity

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Mass Transfer
CO₂ can be absorbed by

Hot cupric oxide
Heated charcoal
Cold Ca(OH)₂
Alumina

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Mass Transfer
For contacting a highly soluble gas with a liquid

None of the listed here
Both of the options given here
Spray the liquid on gas stream
Bubble the gas through liquid

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Mass Transfer
Which of the following assumes constant molal vaporisation and overflow?

McCabe-Thiele method
Plate absorption column
Enthalpy concentration method
Ponchan-Savarit method

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