Which statement best captures the difference between miscible and immiscible substances?

Which statement best captures the difference between miscible and immiscible substances?

• A. Immiscible: dissolve in each other; Miscible: do not mix.
• B. Immiscible: react to form new compounds; Miscible: not reactive.
• C. Miscible: dissolve in each other; Immiscible: do not dissolve in each other.
• D. Both dissolve in each other under high temperature.

Answer: (C)

Two liquids either mix to form one uniform phase or they don’t mix at all and separate into layers. That’s what miscibility is about: if two liquids are miscible, they dissolve in each other; if they are immiscible, they do not dissolve in each other. This makes the statement that miscible substances dissolve in one another and immiscible substances do not dissolve in one another the best description. Think of water and ethanol—miscible and blend into a single phase—versus oil and water—immiscible and form two layers. The other options bring in ideas like chemical reactions or temperature effects, which aren’t what miscibility depends on.

Two liquids either mix to form one uniform phase or they don’t mix at all and separate into layers. That’s what miscibility is about: if two liquids are miscible, they dissolve in each other; if they are immiscible, they do not dissolve in each other. This makes the statement that miscible substances dissolve in one another and immiscible substances do not dissolve in one another the best description. Think of water and ethanol—miscible and blend into a single phase—versus oil and water—immiscible and form two layers. The other options bring in ideas like chemical reactions or temperature effects, which aren’t what miscibility depends on.