Answer:
The highest freezing point will be of pure water.
Step-by-step explanation:
The following are colligative properties:
a) elevation in boiling point
b) relative lowering of vapor pressure
c) depression in freezing point
d) osmotic pressure
The above four properties, depends upon the number of solute particles present.
In case of solute of same concentration, the freezing point depression will be same for aqueous solutions.
If the solute is electrolytic, then the concentration of ions will be counted separately.
Due to addition of any electrolyte the freezing point of water decreases.
So the highest freezing point will be of pure water.