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(B) The boiling point elevation is given by $\Delta T_b = i 	imes K_b 	imes m$. The solution with the highest boiling point will have the highest va

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$0.2 \ m$ $Ba(NO_3)_2$

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(B) The boiling point elevation is given by $\Delta T_b = i 	imes K_b 	imes m$. The solution with the highest boiling point will have the highest value of the van't Hoff factor $(i)$ multiplied by molality $(m)$.For $A$: $i = 2$ $(NaCl ightarrow Na^+ + Cl^-)$,$m = 0.1$,so $i 	imes m = 0.2$.For $B$: $i = 3$ $(Ba(NO_3)_2 ightarrow Ba^{2+} + 2NO_3^-)$,$m = 0.2$,so $i 	imes m = 0.6$.For $C$: $i = 4$ $(Na_3PO_4 ightarrow 3Na^+ + PO_4^{3-})$,$m = 0.01$,so $i 	imes m = 0.04$.For $D$: $i = 2$ $(KNO_3 ightarrow K^+ + NO_3^-)$,$m = 0.03$,so $i 	imes m = 0.06$.Comparing the values,$0.6$ is the highest,therefore $0.2 \ m$ $Ba(NO_3)_2$ has the highest boiling point.

Which of the following aqueous solutions has the highest boiling point?

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