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(B) The depression in freezing point $(\Delta T_f)$ is a colligative property,which depends on the number of solute particles in the solution.
The re

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$0.1 \ M$ sugar solution

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(B) The depression in freezing point $(\Delta T_f)$ is a colligative property,which depends on the number of solute particles in the solution.
The relationship is given by $\Delta T_f = i 	imes K_f 	imes m$.
Since the freezing point $T_f = T_f^0 - \Delta T_f$,a smaller value of $\Delta T_f$ results in a higher freezing point.
Sugar is a non-electrolyte $(i = 1)$,while $NaCl$ $(i = 2)$,$BaCl_2$ $(i = 3)$,and $FeCl_3$ $(i = 4)$ dissociate into ions.
Among the given options,the sugar solution has the minimum number of particles,leading to the minimum depression in freezing point and thus the highest freezing point.

Which of the following will have the highest freezing point $(F.P.)$ at one atmosphere?

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