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(A) The depression in freezing point is given by $\Delta T_f = i 	imes K_f 	imes m$. Since $K_f$ and $m$ are constant for all solutions,the depressi

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Urea

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(A) The depression in freezing point is given by $\Delta T_f = i 	imes K_f 	imes m$. Since $K_f$ and $m$ are constant for all solutions,the depression in freezing point depends on the van't Hoff factor $(i)$. Lower $i$ value leads to a smaller depression in freezing point,which corresponds to a higher freezing point. $i$ values are: Urea: $i = 1$ $BaCl_2$: $i = 3$ $KBr$: $i = 2$ $Al_2(SO_4)_3$: $i = 5$ Since urea has the lowest $i$ value,it will have the minimum depression in freezing point and thus the highest freezing point.

Which of the following aqueous solutions will have the highest freezing point?

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