Mass Transfer
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that

The system comprises of partially mis-cible liquids
The system comprises of an azeotrope
The system comprises of miscible liquids
On heating, a vapor phase will appear ; while on cooling, a solid phase will appear

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Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

None of these
Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the wet bulb temperature of the surrounding air
Hot water entering and the cooled water leaving the cooling tower

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Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

And dehumidified with decrease in wet bulb temperature
At the same relative humidity
And humidified
And dehumidified with increase in wet bulb temperature

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