The correct matches of pair are: A-III, B-I, C-IV, D-II. (A) Molal elevation constant or ebullioscopic constant is defined as the elevation in boiling point when one mole of non-volatile solute is added to one kilogram of solvent. Its unit is Kkgmol−1. (B) Cryoscopic constant is defined as the depression of freezing point of the solvent produced on dissolving one mole of a substance in 1000g of it. It is also called molal depression constant. (C) Henry's law is a gas law which states that the amount of gas that is dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid when the temperature is kept constant. (D) Dalton's law states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.