Mass Transfer
Pick out the system with minimum boiling azeotrope at 1 atm.

Hydrochloric acid-water
Benzene-toluene
Ethyl alcohol-water
All of these

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

All of these
Helps in increasing the settling rate of the bubbles
Comprises of thin bed of substances of extended surface having high porosity
Helps in increasing the bubble size entering the settler

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