Which of the following aqueous solutions will show maximum vapour pressure at 300K?

Step-by-step solution

Relative lowering of vapour pressure is a colligative property, which depends on the number of solute particles in the solution. P i C For maximum vapour pressure, the lowering of vapour pressure ( P ) must be minimum, which means the van't Hoff factor ( i ) should be minimum (since concentration C is 1 M for all options). For NaCl, i = 2 For CaCl ₂ , i = 3 For AlCl ₃ , i = 4 For C ₁₂ H ₂₂ O ₁₁ (sucrose), i = 1 Since sucrose has the minimum value of i , its solution will have the minimum lowering of vapour pressure