$A$ solution of a nonvolatile solute is obtained by dissolving $1 \ g$ in $100 \ g$ of solvent,which decreases its freezing point by $0.3 \ K$. Calculate the cryoscopic constant of the solvent if the molar mass of the solute is $60 \ g \ mol^{-1}$.
- A$1.0 \ K \ kg \ mol^{-1}$
- B$1.4 \ K \ kg \ mol^{-1}$
- C$2.4 \ K \ kg \ mol^{-1}$
- D$1.8 \ K \ kg \ mol^{-1}$
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