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Relative Lowering of Vapour Pressure

Which of the ...

Question

Which of the following has the highest freezing point?

1 m

N a C l

solution

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1 m

K C l

solution

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1 m

A l {C l}_{3}

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1 m

C_{6} H_{12} O_{6}

solution

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Solution

The correct option is D $1 m$ $C_{6} H_{12} O_{6}$ solution
$i$ ${Δ T}_{f}$
$1 M$ $N a C l$ $i = 2$ $2 {Δ T}_{f}$
$1 M$ $K C l$ $i = 2$ } electrolytes $2 {Δ T}_{f}$
$1 M$ ${A l C l}_{3}$ $i = 4$ $4 {Δ T}_{f}$
$1 M$ $C_{6} H_{12} O_{6}$ solution $i = 1$ $⟶$ non-electrolytes ${Δ T}_{f}$
(glucose)
${Δ T}_{f} = T_{0} - T_{f}$ { $T_{0} =$ Freezing point of solvent}
$T_{f} = T_{0} - {Δ T}_{f}$
${Δ T}_{f}$ is minimum for glucose solution so its $T_{f}$ value (freezing point) will be maximum.

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