Which of the following solutions would have the lowest freezing point?
Correct: C
Freezing point depression is a colligative property, meaning it depends on the number of solute particles in the solution. The more particles, the greater the depression. Glucose and sucrose are non-electrolytes and dissolve into 1 particle. NaCl dissolves into 2 particles (Na⁺ and Cl⁻). MgCl₂ dissolves into 3 particles (Mg²⁺ and 2Cl⁻). Therefore, 1.0 m MgCl₂ will have the lowest freezing point.