Mass Transfer
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

Minimum
Operating
Total
Maximum permissible

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Mass Transfer
In a counter-current liquid extractor

Both liquids flow at fixed rate
Both liquids can have any desired flow rate
Liquid's flow rate depends upon the temperature and pressure
Only one of the liquids may be pumped at any desired rate

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