$0.1 m$ urea solutions will have freezing point $(K_{f} = 1.86 K k g m o l^{- 1})$ :

273.093 K

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273.186 K

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272.907 K

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272.814 K

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Solution

The correct option is D $272.814 K$
Depression in freezing point $(Δ T_{b}) = i \times K_{b} \times m$

$= 1 \times 1.86 \times 0.1 = {0.186}^{o} C$

Freezing point of Water $= 0^{o} C$

Freezing point of $0.1 m$ urea

$= 0^{o} C - 0.186 = - {0.186}^{o} C = 272.814 K$

$∴$ option D is correct.

Suggest Corrections

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- {0.186}^{o}

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