Elevation in b.p. of an aqueous urea solution is \( 0.52^{\circ} \). ( \( \left.\mathrm{K}_{\mathrm{b}}=0.52^{\circ} \mathrm{mol}^{-1} \mathrm{~kg}\right) \) Hence, mole-fraction of urea in this solution is :
(1) \( 0.982 \)
(2) \( 0.567 \)
(3) \( 0.943 \)
(4) \( 0.018 \)
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