Mass Transfer
__________ extractor is used for the concentration of radioactive nuclear waste.

Mixer-settler
Seive plate
Pulsed column
None of the listed here

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Mass Transfer
When the solvent dissolves very little of solute, then

Solvent of low latent heat of vaporisation should be used
Very small quantity of solvent is required
Solvent of low freezing point should be used
Large quantity of solvent is required to extract the solute

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