Which statement best describes miscibility?

Which statement best describes miscibility?

• A. It relates to solubility in water only.
• B. It is a measure of vapor pressure.
• C. It is the ability to be mixed or blended with another substance.
• D. It indicates a substance's toxicity.

Answer: (C)

Miscibility is about whether two substances can be combined and stay uniformly mixed without separating into distinct layers. The statement that best describes miscibility is the ability to be mixed or blended with another substance, because it captures the essence of whether two liquids form a single, homogeneous phase in any proportion (completely miscible) or if they separate (immiscible). Other ideas—the vapor pressure measures how readily a substance evaporates, which is about volatility, not mixing; solubility describes how much of a substance dissolves in a solvent (often water) rather than whether two liquids mix in all proportions; and toxicity relates to harmful effects, not mixing behavior. For example, ethanol and water mix in all proportions, while oil and water do not, illustrating the concept of miscibility in practice.

Miscibility is about whether two substances can be combined and stay uniformly mixed without separating into distinct layers. The statement that best describes miscibility is the ability to be mixed or blended with another substance, because it captures the essence of whether two liquids form a single, homogeneous phase in any proportion (completely miscible) or if they separate (immiscible).

Other ideas—the vapor pressure measures how readily a substance evaporates, which is about volatility, not mixing; solubility describes how much of a substance dissolves in a solvent (often water) rather than whether two liquids mix in all proportions; and toxicity relates to harmful effects, not mixing behavior. For example, ethanol and water mix in all proportions, while oil and water do not, illustrating the concept of miscibility in practice.