$13.$ Azeotropic distillation is a method to:

$-$ A$.$ Increase the efficiency of extraction

$-$ B$.$ Break azeotropes during distillation

$-$ C$.$ Create azeotropes for easier separation

$-$ D$.$ Decrease the boiling point of the solvent

$14.$ The main advantage of supercritical fluid extraction is:

$-$ A$.$ High selectivity and low operating temperature

$-$ B$.$ It can be used with immiscible solvents only

$-$ C$.$ It requires no solvent

$-$ D$.$ It is the cheapest method of extraction

$15.$ The distribution coefficient in solvent extraction depends on:

$-$ A$.$ Temperature and pressure only

$-$ B$.$ The solute and solvent nature

$-$ C$.$ Only the nature of the solute

$-$ D$.$ Only the nature of the solvent

$16.$ Solvent loss in an extraction process is primarily reduced by:

$-$ A$.$ Using miscible solvents

$-$ B$.$ Increasing the number of stages

$-$ C$.$ Recycling the solvent

$-$ D$.$ Decreasing the extraction temperature