The amount of Urea to be dissolved is 500cc of water ( $K_{f}$ =1.86) to produce a depression of ${0.186}^{\circ} C$ in the freezing point is

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0.3g

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Solution

The correct option is C 3g
$Δ T = K_{f} \times \frac{W_{B} \times 100}{M_{B} \times W_{A}} 0.186 = 1.86 \times \frac{W_{B} \times 1000}{60 \times 500} W_{B} = 3 g$

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500 c c

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The amount of urea to be dissolved in 500 ml of water (K =18.6 K mole^-1 in 100g solvent) to produce a depression of 0.186°C in freezing point is

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