Mass Transfer
For a single component absorber, the operating line is straight only when plotted in term of __________ units.

Mole fraction
Mole ratio
None of these
Partial pressure

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Mixture (to be separated) shows negative deviation from ideality
Multicomponent distillation is involved
Mixture (to be separated) shows positive deviation from ideality
Relative volatility is reasonably constant

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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

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

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