Which of the following aqueous solution has highest freezing point ?

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0.1 molal ${Al}_{2} {({SO}_{4})}_{3}$

0.1 molal ${BaCl}_{2}$

0.1 molal ${AlCl}_{3}$

0.1 molal ${NH}_{4} Cl$

answer is D.

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Detailed Solution

The molality of all four solutions is the same. The solution that produces the fewest ions during the dissociation of solute particles will result in the least amount of freezing point depression. The freezing point of such a solution is the highest.

Hence, the correct option (D). 0.1 molal ${NH}_{4} Cl$

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