Question

Which aqueous solution of Kl freezes at the lowest temperature?

a) 2 mol of Kl in 1,000. g of water
b) 1 mol of Kl in 1,000. g of water
c) 2 mol of Kl in 500. g of water
d) 1 mol of Kl in 500. g of water

Answer 1

The correct answer is B.
Lowering of the freezing point can be a colligative property. The greatest concentration of mass of salt in the water will have what we call the lowest freezing point.
For example the least amount of water in the greatest amount of salt.

Answer 2

c) 2 mol of Kl in 500. g of water

Step-by-step explanation:

Colligative properties such as melting and boiling points and osmotic pressure all depend on the amount of solute present. The more the concentration of solute present, the greater the degree of display of colligative properties by a solution

Considering the options given, 2 mol of Kl in 500. g of water has the highest concentration and is expected to freeze at the lowest temperature.