Answer: sodium benzoate.
- A only sodium chloride
- B sodium benzoate
- C plain glucose
- D only citric acid
Correct answer: B. sodium benzoate
Explanation: Sodium benzoate is a widely used chemical preservative in acidic foods such as jams and fruit squashes.
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.