Elevation in the boiling point for $1 \ m$ solution of glucose is $2 \ K$. The depression in the freezing point for $2 \ m$ solution of glucose in the same solvent is $2 \ K$. The relation between $K_b$ and $K_f$ is
- A$K_b = 1.5 K_f$
- B$K_b = K_f$
- C$K_b = 0.5 K_f$
- D$K_b = 2 K_f$
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