Read the following statements regarding the vapour pressure of a solution containing a non-volatile solute: (I) The relative lowering of vapour pressure is equal to the mole fraction of the solute. (II) For a given solution, the relative lowering of vapour pressure increases with an increase in temperature. (III) For a given solution, the absolute lowering of vapour pressure increases with an increase in temperature.

Step-by-step solution

Statement (I) is correct as per Raoult's law: P P^0 = _ solute . Statement (II) is incorrect because the relative lowering of vapour pressure is equal to the mole fraction of the solute, which is a temperature-independent concentration term. Statement (III) is correct. The absolute lowering of vapour pressure is P = P^0 _ solute . Since the vapour pressure of the pure solvent ( P^0 ) increases with temperature and the mole fraction ( _ solute ) remains constant, P must increase with temperature. Statement (IV) is i