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

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

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Temperature of the liquid phase is equal to that of the vapor phase
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
Total pressure throughout the liquid phase is equal to that throughout the vapor phase
All of these

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