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Which has maximum freezing point?

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$6 g$ of urea solution in $100 g H_{2} 0$

6 g acetic acid solution in $100 g H_{2} 0$

6 g sodium chloride in $100 g H_{2} 0$

All have equal freezing point

answer is A.

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Detailed Solution

As quantity of solute $(i \times n) ↑, T_{f} ↓$

Since molarity is 1 molar in all four options, their freezing point will depend on 'i'

In A, i = 2
In B, i = 2
In C, i = 3
In D, i = 1 , i.e. there is no dissociation

Therefore, the maximum freezing point will be for urea

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