Which of the following 0.10 M aqueous solution will have the lowest freezing point.

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

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

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$B a S O_{4}$

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Solution

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

$D e p r e s s i o n i n f r e e z i n g p o i n t α i i = 1 + (n - 1) α; i α n (i f α i s s a m e) A l_{2} (S O_{4})_{3} \to 2 A l^{+ 3} + 3 S O_{4}^{- 2} n = 5 B a S O_{4} \to B a^{2 +} + S O_{4}^{2 -} [Δ T_{f} \propto \frac{1}{i \times m}] n = 2 K I \to K^{+} + I^{-} n = 2$

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