Read the Assertion and Reason below and choose the correct option. — Solutions and Colligative Properties Chemistry Question

💡 Solution & Explanation

Adding a solute lowers the vapour pressure of the liquid solvent. If the system is at the original freezing point, the liquid solution's vapour pressure drops below that of the solid solvent, causing the solid to melt (fuse) to restore equilibrium. To reach a new state where the vapour pressures of solid and liquid are equal, the temperature must be lowered. Both are true, and II is the thermodynamic explanation of I. Therefore, correct answer is A.