The boiling point of a $0.1 \ m$ aqueous solution of urea is $100.18 \ ^\circ C$ at $1 \ atm$. The molal elevation constant $(K_b)$ of water is:
- A$1.8 \ K \ kg \ mol^{-1}$
- B$0.18 \ K \ kg \ mol^{-1}$
- C$18 \ K \ kg \ mol^{-1}$
- D$18.6 \ K \ kg \ mol^{-1}$
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