Which of the following is an example of a dispersed system?

• A. An emulsion
• B. A true solution
• C. A gas
• D. A homogeneous mixture

Answer: (A)

Dispersed systems are two-phase, where small droplets or particles of one phase are distributed within a continuous other phase. An emulsion is exactly that: tiny droplets of one liquid dispersed in another immiscible liquid (for example, oil droplets in water), creating a heterogeneous system with a distinct dispersed phase.

A true solution is uniform at the molecular level, so there’s no separate dispersed phase—it's a single-phase mixture. A gas is also a single phase in this context, unless it’s formed into an aerosol, which isn’t the case here. A homogeneous mixture is uniform throughout and lacks dispersed droplets or particles. Thus, an emulsion best fits the idea of a dispersed system.