Chemistry halp please

Question

4. Which of the following is lower for a 1.0 molar aqueous solution of any solute than it

is for pure water?

a. pH

b. Vapor pressure

c. Freezing point

d. Electrical conductivity

e. Absorption of visible light

Answer 1

We can rule out a, because we can always add a basic solute (raise pH).

b can be ruled out, as adding a volatile solute will raise the total vapor pressure of the solution.

d is wrong; adding an ionic compound will raise conductivity.

e is obviously wrong; add some dye, and absorption of the solution will increase.

This leaves c as the correct answer: freezing point always decreases for solutions.