MHT CET202012 Oct 2020Evening ShiftChemistrySurface ChemistryActual
When soap is added to an oily part of cloth, the hydrocarbon part of soap dissolves in
Options
- AWater, keeping the tail away from the oil
- BOil, keeping the head away from the oil
- CWater, keeping the head away from the oil
- DOil, keeping the tail away from the oil
Correct answer
B. Oil, keeping the head away from the oil
Step-by-step solution
When soap is added to an oily or greasy part of cloth, the hydrocarbon part of soap dissolves in oil, keeping the head away from the oil. Big molecules of oil and soap break by rubbing into small emulsified oil droplets in water, which are washed away by stream of water.