Materials that will not mix or dissolve into each other are called what?

• A. Miscible
• B. Soluble
• C. Immiscible
• D. Insoluble

Answer: (C)

Immiscible describes two materials that cannot form a single, uniform phase when combined. When immiscible liquids are mixed, they separate into distinct layers instead of blending. Oil and water are the classic example: they don’t dissolve into one another and you end up with two layers. This differs from miscible liquids, which mix completely to create one homogeneous phase. Soluble and insoluble describe whether a substance can dissolve in a solvent, not whether two liquids will mix; soluble means it can dissolve, insoluble means it cannot. The phrase “will not mix or dissolve into each other” points to immiscible, since it highlights the inability to form a single mixture rather than a failure to dissolve.