Answer: D. Â the ionic compound calcium fluoride [tex](CaF_2)[/tex]
The correct option here is the fourth one.
Explanation:
Salt like compounds addition to water is likely to be inducing certain changes in temperature of freezing into solid and also alter the temperature of boiling. Â
It is noticed that addition of salts in water mostly tends to get lower the freezing temperatures from the original freezing point of water and among the given 3 options calcium fluoride tends to lower the freezing point most when compared to others.
Thus as vant hoff factor is highest factor for [tex]CaF_{2}[/tex] and the freezing point will be lowest.
