Answer: Anionic.
- A Cationic
- B Non-ionic
- C Anionic
- D Zwitterionic
Correct answer: C. Anionic
Explanation: Anionic detergents have a negatively charged hydrophilic head, e.g. sodium lauryl sulphate, commonly used in toothpastes and shampoos.
The hydrophobic hydrocarbon tail of each soap/detergent molecule dissolves into an oily dirt droplet, while the hydrophilic (ionic) head stays in the surrounding water - trapping the grease inside a micelle that rinses away with water.
Concept context
Drugs and how they interact with biological targets, chemicals in food, and cleansing agents (soaps and detergents) - chemistry applied directly to daily life and healthcare.