$1.$ What does a point inside a ternary phase diagram represent?

$-$ A$.$ A pure component

$-$ B$.$ A binary mixture

$-$ C$.$ A ternary mixture

$-$ D$.$ An immiscible mixture

$2.$ In a ternary phase diagram, what does a tie$-$line connect?

$-$ A$.$ Two immiscible liquids

$-$ B$.$ The boiling and freezing points

$-$ C$.$ Two phases in equilibrium

$-$ D$.$ The critical points of components

$3.$ What is the primary goal of solvent selection in extraction processes?

$-$ A$.$ Maximize cost

$-$ B$.$ Maximize reaction speed

$-$ C$.$ Maximize selectivity and efficiency

$-$ D$.$ Maximize pressure

$4.$ What defines a single$-$stage extraction process?

$-$ A$.$ Multiple contacts between phases

$-$ B$.$ One$-$time contact between phases

$-$ C$.$ Continuous contact between phases

$-$ D$.$ No contact between phases