Emulsions are physically unstable.

Emulsions are physically unstable.

• A. Cannot be determined
• B. False
• C. Both are possible
• D. True

Answer: (D)

Emulsions are physically unstable because they are dispersions of one liquid in another immiscible liquid, creating a large interfacial area with high interfacial tension. The system naturally tends to reduce that area, so droplets coalesce and separate into distinct phases over time. Differences in density cause creaming or sedimentation, and processes like Ostwald ripening can cause small droplets to shrink while larger ones grow, ultimately leading to phase separation. Emulsifiers or stabilizers can slow these processes and provide kinetic stability, but they don’t make the system thermodynamically stable. Therefore, the statement is true.

Emulsions are physically unstable because they are dispersions of one liquid in another immiscible liquid, creating a large interfacial area with high interfacial tension. The system naturally tends to reduce that area, so droplets coalesce and separate into distinct phases over time. Differences in density cause creaming or sedimentation, and processes like Ostwald ripening can cause small droplets to shrink while larger ones grow, ultimately leading to phase separation. Emulsifiers or stabilizers can slow these processes and provide kinetic stability, but they don’t make the system thermodynamically stable. Therefore, the statement is true.