Which of the following 0.10 m aqueous solutions will have the lowest freezing point?

A l_{2} (S O_{4})_{3}

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K I

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C_{6} H_{12} O_{6}

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C_{12} H_{22} O_{11}

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Solution

The correct option is A $A l_{2} (S O_{4})_{3}$
There is a depression in freezing point of a solvent when a non-volatile solute is added to it.
$Δ T_{f} = i K_{f} m$
Since the molality is given, we need to look at the $i$ value of the options to get the answer.
$A l_{2} (S O_{4})_{3}$ will have the greatest value of van 't Hoff factor $(i = 5)$ , its solution would have the lowest freezing point.

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0.10 m

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