What is the cryoscopic constant of water if $5 \ g$ of glucose in $100 \ g$ of water causes a depression in freezing point of $2.15 \ K$? (Molar mass of glucose $= 180 \ g \ mol^{-1}$)
- A$7.74 \ K \ kg \ mol^{-1}$
- B$0.52 \ K \ kg \ mol^{-1}$
- C$1.32 \ K \ kg \ mol^{-1}$
- D$3.86 \ K \ kg \ mol^{-1}$
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