$55.$ What is the primary advantage of steam distillation over other types of distillation processes?

$-$ A$)$ It allows for the distillation of temperature$-$sensitive compounds.

$-$ B$)$ It requires no external heat source.

$-$ C$)$ It can separate components with identical boiling points.

$-$ D$)$ It is more energy$-$efficient than vacuum distillation.

$56.$ The McCabeThiele method is best described as a graphical technique used to determine:

$-$ A$)$ The minimum energy required for distillation.

$-$ B$)$ The number of theoretical stages in a distillation column.

$-$ C$)$ The optimal feed location in a distillation column.

$-$ D$)$ The heat exchange efficiency between stages.

$57.$ In the PonchonSavarit method, which two main properties are graphically analyzed for each stage of separation?

$-$ A$)$ Temperature and pressure

$-$ B$)$ Enthalpy and composition

$-$ C$)$ Density and viscosity

$-$ D$)$ Vapor pressure and mole fraction

$58.$ The Fenske equation is vital for calculating:

$-$ A$)$ The optimal reflux ratio in distillation.

$-$ B$)$ The minimum number of theoretical stages at total reflux.

$-$ C$)$ The relative volatility of key components.

$-$ D$)$ The energy consumption per stage.