Question

why is freezing point is lowered when NaCl is added to aqueous solution of glucose

Answer 1

This happens because salt completely dissociates in aqueous solution, while sugar does not. This aspect is important when dealing with colligative properties because the number of particles that you place in solution will differ for the aforementioned compounds.

Answer 2

Obviously, the addition of a pure solute in a solution lowers down the solution’s freezing point. Also it elevates its boiling point since

delta Tf = Kf*m , and,

delta Tb = Kb*m

where m is the molality of the solute added.

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