JEE Main 2022 · 27 July · evening · Single correct · +4 / −1
Which of the following enhances the lathering property of soap?
- (a) Sodium stearate
- (b) Sodium carbonate
- (c) Sodium rosinate
- (d) Trisodium phosphate
Answer and solution
Answer (c) Sodium rosinate
Solution
Chemistry ma’am · 3 steps
Each additive in a soap has one job. The one added to make it lather is sodium rosinate.
- Soap plus additives. Soap is a sodium salt of a long-chain fatty acid. Manufacturers add other substances to it, and each one is there for a particular purpose.
Substance Role in soap Sodium stearate, C₁₇H₃₅COONa the soap itself, not an additive Sodium carbonate, Na₂CO₃ builder or filler in laundry soaps Sodium rosinate makes the soap lather well Trisodium phosphate, Na₃PO₄ builder in laundry soaps that helps the soap clean better - Where it comes from. Sodium rosinate is the sodium salt of rosin, a resin obtained from pine trees. Soaps that contain it form a rich lather.
- So. The lathering property is enhanced by sodium rosinate, option (c).
The idea to keep. Learn soap additives as a role list. Rosinate gives lather, glycerol stops shaving soap from drying, and sodium carbonate and trisodium phosphate are builders in laundry soaps.
Answer from the NTA final answer key. Solution by PrepWiser.