Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CDS2026
Which one among the following statements regarding micelles is not correct ?
- A Soap molecules are sodium or potassium salts of long-chain carboxylic acids.
- B Micelles precipitate out of solution because of ion-ion repulsion. ✓
- C Grease gets collected in the centre of the micelle.
- D Soap micelles scatter light.
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
NDA2021
Which one of the following statements about the cleansing action of soap is not true ?
- A The oil and dirt gets collected in the centre of the micelle.
- B Soap micelles scatter light.
- C Soaps are ammonium salts of long chain carboxylic acids. ✓
- D Soap forms insoluble precipitates with the calcium and magnesium ions in hard water.
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry
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