Answer: Greater than osmotic pressure.
- A Equal to osmotic pressure
- B Less than osmotic pressure
- C Greater than osmotic pressure
- D Zero
Correct answer: C. Greater than osmotic pressure
Explanation: Pressure greater than osmotic pressure forces solvent from concentrated to dilute side, purifying water.
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.