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Question

Which of the following aqueous solution has highest freezing point?

A
0.1 molal Al2(SO4)3
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B
0.1 molal BaCl2
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C
0.1 molal AlCl3
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D
0.1 molal NH4Cl
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Solution

The correct option is D 0.1 molal NH4Cl
The depression in freezing point is directly proportional to the number of non-volatile solute particles present. So, the solution that has the least number of particles would show the highest freezing point.
NH4Cl , i=2 produces the least number of ions among the ones given in the question.

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