Mass Transfer
Which of the following is the most suitable for extraction in a system having very low density difference?

Pulsed extractor
Packed extraction tower
Mixer-settler extractor
Centrifugal extractor

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Number of plates decreases very slowly first and then more and more rapidly
Slope of the operating line in stripping section decreases
Liquid flow increases while the vapor flow decreases for a system
Total cost first decreases and then increases

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