Which of the following is a characteristic of a true solution (as opposed to a colloid or suspension)?

• A. Its particles are large enough to settle out upon standing.
• B. It is a homogeneous mixture at the molecular or ionic level and does not scatter a beam of light (no Tyndall effect).
• C. It is always composed of a solid solute dissolved in a liquid solvent.
• D. It can be separated into solute and solvent by filtration through filter paper.

Answer: (B)