Answer: germicides.
- A germicides
- B sweeteners
- C fuels
- D fertilisers
Correct answer: A. germicides
Explanation: Cationic detergents (quaternary ammonium salts) have germicidal properties and are used in sanitisers and hair conditioners.
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.