Elevation in boiling point for 1.5 molal solution of glucose in water is \( 4 \mathrm{~K} \). Th...

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Elevation in boiling point for 1.5 molal solution of glucose in water is \( 4 \mathrm{~K} \). The depression in freezing point for 4.5 molal solution of glucose in water is \( 4 \mathrm{~K} \). The ratio of molal elevation constant to molal depression constant \( \left(\mathrm{K}_{\mathrm{b}} / \mathrm{K}_{\mathrm{f}}\right) \) is
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