Question

Which of the following properties is NOT true regarding emulsion?

• A. The droplets in emulsions are often negatively charged and can be precipitated by electrolysis.
• B. Emulsions exhibit Brownian movement and Tyndall effect.
• C. The two liquids in emulsion can not be seperated by heating, freezing etc.
• D. The emulsions are stabilised by addition of third component called emulsifying agent.

Hint:

Emulsions can be broken into their two liquids by heating, freezing or centrifuging, which is called demulsification.

Answer 1

The Correct Option is C

Step 1: Elimination
Colloidal behaviour such as Brownian movement, Tyndall effect and charged droplets are normal for emulsions. Options (A) and (B) hold.

Step 2: Stability
Emulsions are stabilised by a third component, the emulsifying agent, so (D) holds.

Step 3: Conclusion
Demulsification by heating or freezing is possible, so option (C) is the false statement.

Final Answer:
The statement about inseparable liquids is the false one. \[ \boxed{\text{(C) }\text{The two liquids in emulsion can not be seperated by heating, freezing etc.}} \]