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Q.

a) 0.1 m glucose

b) 0.2 m urea

c) 0.3 m sucrose

Ratio of molal elevation constants in aqueous solutions, a : b : c  is

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a

1 : 1 : 1

b

6 : 3 : 2

c

3 : 2 : 1

d

1 : 2 : 3

answer is A.

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Detailed Solution

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Kb depends on nature of solvent only ; Kb= RT02M1000HV; Where T0=Boiling point  of solvent in Kelvin scale M=Molar mass of solvent Hv=Enthalpy of vapourization per mole of solvent Kb  does not vary with nature of solute and concentration of solution.

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