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# A solution of urea (mol. mass $60g mol^{–1}$) boils at 100.18$^{\large\circ}$C at the atmospheric pressure. If $K_f$, and $K_b$ for water are 1.86 and 0.512K $kg mol^{–1 }$ respectively the above solution will freeze at

$– 0.654^{\large\circ}$C