Solutions: JEE Mains 2022 June 29 Shift 2

The elevation in boiling point for a $1.5$ molal solution of glucose in water is $4\ \text{K}$. The depression in freezing point for a $4.5$ molal solution of glucose in water is $4\ \text{K}$. The ratio of molal elevation constant to molal depression constant $(K_b/K_f)$ is ______.