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Mass Transfer

Mass Transfer
Selectivity of the solvent used in solvent extraction should be

< 1
> 1
1

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Mass Transfer
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

a₁ = 2a₂
None of these
a₁ = a₂
a₁ = 0.5 a₂

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Mass Transfer
Which is the controlling factor for a drum drier?

Both A & B
Heat transfer
Neither A nor B
Diffusion

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Mass Transfer
Rotary dryers cannot handle __________ materials.

Free flowing
Dry
Sticky
Grannular

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

0.7
7
70
150

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Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

1.24
1.04
1.94
0.54

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