What should be the freezing point of aqueous solution containing $17 gm of C_{2} H_{5} OH in 1000 gm$ of water (water
$K_{f} = 1.86 \deg - kg {mol}^{- 1}$

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-0.69°C

-0.34°C

0.0°C

0.34°C

answer is A.

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Detailed Solution

$\begin{aligned} Δ T_{f} = \frac{1000 \times 1.86 \times 17}{46 \times 1000} = {0.69}^{\circ} C \\ T_{f} = 0 - 0.69 = - {0.69}^{\circ} C \end{aligned}$

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