Mass Transfer
In rectifying section of a continuous distillation column, the

None of these
Liquid is stripped of high boilers
Vapour is enriched with high boilers
Vapour is enriched with low boilers

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Mass Transfer
Blowdown in a cooling tower

Increases the scale forming tendencies of water
Is undesirable
All of these
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities

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