Match the LIST-I with LIST-II.
| LIST-I | LIST-II |
| A. Anoxia | I. Non-ideal solution with negative deviation. |
| B. Cellulose acetate | II. Henry's Law |
| C. Ethanol and acetone solution | III. Reverse Osmosis |
| D. Phenol and aniline solution | IV. Non-ideal solution with positive deviation. |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A-II, B-III, C-IV, D-I
Each item in List-I is a standard example from the study of solutions: the solubility of gases, osmosis, and the two kinds of deviation from Raoult’s law.
A. Anoxia — This matches II. Henry's Law. By Henry’s law (p = KHx), the solubility of a gas falls when its partial pressure falls. At high altitudes the partial pressure of oxygen is low, so less oxygen dissolves in the blood. Climbers become weak and unable to think properly, a condition called anoxia.
B. Cellulose acetate — This matches III. Reverse Osmosis. A cellulose acetate film lets water pass but blocks the ions of the solution. It is used as the semipermeable membrane in desalination, where a pressure larger than the osmotic pressure drives pure water out of sea water.
C. Ethanol and acetone solution — This matches IV. Non-ideal solution with positive deviation. Acetone molecules come between ethanol molecules and break some of their hydrogen bonds. The A–B attractions are weaker, so the vapour pressure is higher than Raoult’s law predicts.
D. Phenol and aniline solution — This matches I. Non-ideal solution with negative deviation. The –OH hydrogen of phenol forms a hydrogen bond with the nitrogen lone pair of aniline. This attraction is stronger than those in either pure liquid, so the vapour pressure is lower than predicted.
Shortcut: The pair A–II appears in Options (3) and (4), and C–IV then leaves only Option (3).