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Q.

Density of 1 M solution of a non-electrolyte $C_{6} H_{12} O_{6}$ is $1.18 g / mL$ .If $K_{f} (H_{2} O)$ is ${1.86}^{\circ} {mol}^{- 1} kg$ solution freezes at

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a

-1.86°C

b

-3.16°C

c

-1.58°C

d

1.86°C

answer is B.

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Detailed Solution

Density of 1 M solution of a non-electrolyte $C_{6} H_{12} O_{6}$ is $1.18 g / mL$ .

$Δ T_{f} = 1.86 \times \frac{1000}{1180 - 180}$

$= 1.86 K$ or $^{\circ} C$

$T_{f} = - {1.86}^{\circ} C$

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