Mass Transfer
Agitator is provided in a crystalliser for

Formation of nuclei
All of these
Crystal growth
Avoiding deposition on cooler surfaces

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Mass Transfer
Entrainer used in azeotropic distillation should

Form a new azeotrope of low relative volatility with one of the constituents of the mixture
Have high latent heat of vaporisation
Form a low boiling azeotrope with one of the constituents of the mixture
Have high viscosity to provide high tray efficiency

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Mass Transfer
An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)

More number of trays are required and the residue composition is more dilute in methanol
Less number of trays are required
More number of trays are required but the residue composition remains unchanged
Composition of the residue remains unchanged

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