Which of the following is an example of a colligative property?

Colligative properties are properties of solutions that depend on the number of solute particles in a given amount of solvent, rather than on the specific identity of the solute. Boiling point elevation is a prime example of a colligative property because it occurs when a non-volatile solute is added to a solvent, resulting in an increase in the boiling point of the solution compared to the pure solvent. The elevation in boiling point can be quantitatively described by the formula ΔT_b = i * K_b * m, where ΔT_b is the change in boiling point, i is the van 't Hoff factor, K_b is the ebullioscopic constant, and m is the molality of the solution.

Other options provided, such as viscosity, color change, and pH level, do not fit the definition of colligative properties. Viscosity relates to how thick or thin a liquid is, and while it can be affected by concentration, it does not solely depend on the number of solute particles. Color change reflects chemical interactions, not solely the number of solute particles affecting the solution. The pH level measures the acidity or basicity of a solution and is influenced by the identity and concentration of