Of the following 0.10 m aqueous solution, which one will exhibit the largest freezing point depression?

$K C l$

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

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

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$K_{2} S O_{4}$

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Solution

The correct option is C
$A l_{2} (S O_{4})_{3}$

$Δ T_{f} = i \times K_{f} \times m$
$S o, Δ T_{f} \propto i$ (van't Hoff factor)
$\begin{matrix} S a l t & i K C l & 2 C_{6} H_{12} O_{6} & 1 A l_{2} (S O_{4})_{3} & 5 K_{2} S O_{4} & 3 \end{matrix}$
Hence, i is maximum i.e., 5 for $A l_{2} (S O_{4})_{3}$

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