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(A) The elevation in boiling point is a colligative property,which depends on the van't Hoff factor $(i)$ and the concentration of the solute particle

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$0.1 \ M$ Urea

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(A) The elevation in boiling point is a colligative property,which depends on the van't Hoff factor $(i)$ and the concentration of the solute particles. The formula is $\Delta T_b = i 	imes K_b 	imes m$. Since the molality $(m)$ is the same for all solutions $(0.1 \ M)$,the solution with the minimum van't Hoff factor $(i)$ will have the minimum boiling point elevation,and thus the minimum boiling point. For Urea (non-electrolyte),$i = 1$. For $K_2SO_4$ $(2K^+ + SO_4^{2-})$,$i = 3$. For $NaCl$ $(Na^+ + Cl^-)$,$i = 2$. For $FeCl_3$ $(Fe^{3+} + 3Cl^-)$,$i = 4$. Comparing the values,Urea has the lowest $i$ value $(1)$,therefore $0.1 \ M$ Urea has the minimum boiling point.

Which of the following aqueous solutions should have the minimum boiling point?

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