The freezing point of one molal $NaCl$ solution,assuming $NaCl$ to be $100\%$ dissociated in water,is ............ $^oC$. (molal depression constant $= 1.86$)
- A$ - 1.86$
- B$ - 3.72$
- C$ + 1.86$
- D$ + 3.72$
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