Mass Transfer
The adiabatic saturation curve for a vapour-gas mixture is

Slightly concave downward
None of these
Slightly concave upward
Straight line

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

Viscosity of liquid components is very high
One of the liquid components has very high affinity towards the solvent
One of the liquid components is heat sensitive
Extracting solvent is cheaply & abundantly available

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