Mass Transfer
Which of the following operations does not involve leaching?

Removing nicotine from its water solution by kerosene
Dissolving gold from ores
Dissolving pharmaceutical products from bark or roots
Dissolving sugar from the cells of the beet

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

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