Question

Which of the following 0.1 M aqueous solutions will have the lowest freezing point?

Options

• K₂SO₄

• NaCl

• Urea

• Glucose

Answer 1

K₂SO₄

Explanation:

When potassium sulphate (K₂SO₄) dissolves in water, it breaks down into two potassium ions (K⁺) and one sulphate ion \[\ce{(SO^{2-}_4)}\], resulting in a total of three ions per molecule. Since it produces most ions in solution, it will have the lowest freezing point among the given options.