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Question

Which of the following 0.10 m aqueous solution will have the lower freezing point?

A
Al2(SO4)3
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B
C6H12O6
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C
KI
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D
C12H22O11
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Solution

The correct option is B Al2(SO4)3
The depression in freezing point depends on the Van't Hoff factor.

For Al2(SO4)3, i=5

For C6H12O6, i=1

For KI, i=2

For C12H22O11,2>i>1

As Al2(SO4)3 gives the maximum number of ions on dissociation, therefore it will have the lowest freezing point.

Hence, the correct option is A

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