Question

Potassium stearate is obtained by the saponification of an oil or fat. It has formula CH\(_3\)–(CH\(_2\))\(_{16}\)–COOK. The molecule has a lyophobic terminal CH\(_3\) and a lyophilic terminal –COOK. Potassium stearate is an example of

• A. lyophilic colloid
• B. lyophobic colloid
• C. macromolecular colloid
• D. micelle

Hint:

Soap + water → micelle formation (cleansing action).

Answer 1

The Correct Option is D

Understanding the Concept: Soap molecules form micelles in solution.

Step 1: Molecule has hydrophobic tail (CH$_3$–chain).

Step 2: It also has hydrophilic head (–COOK).

Step 3: Such molecules aggregate to form micelles in water.

Step 4: Micelles trap grease inside hydrophobic core.
Final Answer:
Correct answer = Micelle