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Mass Transfer

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

> 10
5 to 10
1
1 to 5

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Mass Transfer
The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called

None of these
Percolation
Decoction
Elutriation or elution

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Mass Transfer
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for

Constant relative volatility
All of these
Constant molal overflow
Total reflux

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Mass Transfer
In case of absorption, both the operating and equilibrium lines will be straight for

Dilute solutions and isothermal operation
Isothermal operation
Dilute solutions
None of these

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Mass Transfer
Minimum possible diameter of a packed coloumn is decided mainly by the

Flooding
Liquid hold up
Liquid density
Gas viscosity

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Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Minimum
Zero
Infinite
Maximum

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