Answer: A homogeneous mixture of solute and solvent.
- A A heterogeneous mixture in most cases
- B A homogeneous mixture of solute and solvent
- C A mixture of two immiscible liquids under typical conditions
- D A suspension of solid in liquid according to standard textbooks
Correct answer: B. A homogeneous mixture of solute and solvent
Explanation: A solution is a uniform, homogeneous mixture of a solute dissolved in a solvent.
Adding a non-volatile solute lowers the solvent's vapour pressure at every temperature, which is the root cause behind all four colligative properties: it shifts the freezing point down and the boiling point up.
Concept context
Learn how substances dissolve and form mixtures. Covers concentration terms, colligative properties (boiling point elevation, freezing point depression, osmotic pressure), and ideal vs non-ideal solution behaviour.