What will be the freezing point of a 0.5molal KCl solution? The motal freezing point constant of water is 1.86 cm^-1

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-0.372° C

0° C

-1.86° C

-3.2° C

answer is A.

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Detailed Solution

$\begin{array}{l} {ΔT}_{f} = i \times k_{f} \times m \\ = 2 \times 1.86 \times 0.5 = 1 . 86^{\circ} C \\ T_{f}^{s} = T_{f}^{0} - {ΔT}_{f} = 0 - 1.86 = - 1 . 86^{\circ} C \end{array}$

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