If the arrangement of vessels is changed in the experiment as: Dry air Pure Solvent Solution Absorbe — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

In this reversed arrangement, dry air first gets saturated with vapour from the pure solvent (pressure becomes $P^\circ$). When it passes through the solution (which has a lower equilibrium vapour pressure, $P$), the air is supersaturated relative to the solution. Vapour will condense out of the air into the solution, causing the mass of the solution to *increase*, making statement (b) incorrect. Therefore, correct answer is B.