Answer: increases.
- A decreases
- B increases
- C stays constant
- D falls to zero
Correct answer: B. increases
Explanation: For most solids, dissolution is endothermic, so solubility increases with temperature.
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.