What are broad examples of emulsifiers?

• A. Surfactants, stabilizers, and thickeners
• B. Water, air, and solvents
• C. Acids, bases, and salts
• D. Solvents and catalysts

Answer: (A)

Emulsifiers stabilize mixtures of immiscible liquids by acting at interfaces and by modifying the properties of the continuous phase. Broadly, they include surfactants, stabilizers, and thickeners. Surfactants are the classic emulsifiers; their amphiphilic nature lets them sit at oil–water interfaces and lower interfacial tension, helping droplets form and resist coalescence. Stabilizers provide a network or adsorb onto droplet surfaces to give steric or electrostatic barriers that prevent droplets from coming back together. Thickeners increase the viscosity of the continuous phase, slowing droplet movement and reducing separation mechanisms like creaming or sedimentation. Water, air, and solvents aren’t emulsifiers themselves—they’re phases or media in an emulsion. Acids, bases, salts, solvents, and catalysts can influence stability, but they aren’t emulsifiers in the broad sense.