1. Nature of solute only
2. Nature of the solute and the concentration of solution
3. Nature of the solvent and the concentration of solution
4. Nature of solvent only

Solution: 3. Nature of the solvent and the concentration of solution

The freezing point shift ΔT_f (also known as the freezing point depression, Td) is calculated as follows:

ΔT_f  = (T_f of pure solvent) – (T_f  of solution)

This shows that the magnitude of ΔT_f  depends upon the nature of the solvent and the concentration of the solution

ΔT_f is also equal to Kf * (molality of solution), where Kf is the freezing point depression.