Which of the following solutions has maximum freezing point?

1 molar of

N a C l

solution

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1 molar of

K C l

solution

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1 molar of

C a {C l}_{2}

solution

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1 molar of urea solution

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Solution

The correct option is D 1 molar of urea solution
1 molar of urea solution has maximum freezing point.
The depression in the freezing point is a colligative property and depends on the number of solute particles present in the solution. All the given solutions have same molarity. However, urea is non electrolyte (do not dissociate in aqueous solution) whereas $N a C l$ , $K C l$ and $C a C l_{2}$ are electrolytes (dissociate in aqueous solution). Hence, 1 molar of urea solution gives least number of solute particles in a given amount of solvent. 1 molar of urea solution has lowest depression in the freezing point and maximum freezing point.
Note:
$Δ T_{f} = i K_{f} m$
$Δ T_{f} \propto i$

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which of the following solution has maximum value of freezing point

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