Answer: Iodine in alcohol-water (2-3%).
- A Phenol dissolved in water
- B Iodine in alcohol-water (2-3%)
- C Iodoform dissolved in ether
- D Chlorine in a glycerol base
Correct answer: B. Iodine in alcohol-water (2-3%)
Explanation: Tincture of iodine is a 2-3 per cent solution of iodine in an alcohol-water mixture, applied to wounds as a powerful antiseptic.
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.