$13.$ What is a critical point in a ternary phase diagram?

$-$ A$.$ The point where all three components are completely miscible

$-$ B$.$ The lowest temperature at which the components are miscible

$-$ C$.$ The highest pressure required for extraction

$-$ D$.$ The composition with the highest boiling point

$14.$ In the context of solvent selection, what does 'selectivity' refer to$?$

$-$ A$.$ The solvent's ability to dissolve all components equally

$-$ B$.$ The solvent's ability to preferentially dissolve one component over another

$-$ C$.$ The temperature range within which the solvent can operate

$-$ D$.$ The pressure at which the solvent operates

$15.$ Which is an example of a continuous contact extractor?

$-$ A$.$ Soxhlet extractor

$-$ B$.$ Mixer$-$settler unit

$-$ C$.$ Centrifugal extractor

$-$ D$.$ Batch stirred tank

$16.$ How does temperature affect the extraction process in a ternary system?

$-$ A$.$ It does not affect the extraction process.

$-$ B$.$ Higher temperatures always increase the solubility of solutes.

$-$ C$.$ Temperature changes can shift the phase equilibrium.

$-$ D$.$ Lower temperatures always lead to better extraction efficiency.