Q28 (CDS-I/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Which one among the following statements regarding micelles is not correct?

Soap molecules are sodium or potassium salts of long-chain carboxylic acids.

Micelles precipitate out of solution because of ion-ion repulsion.

Grease gets collected in the centre of the micelle.

Soap micelles scatter light.

Result

Your answer: — · Correct: B

Explanation

The incorrect statement is Option B. In a soap solution, micelles do not precipitate; instead, they remain suspended as a stable colloid. This stability is maintained by ion-ion repulsion between the similarly charged (negatively charged) hydrophilic heads on the surface of the micelles, which prevents them from aggregating and settling out of the solution.

Option A: Correct. Soaps are sodium or potassium salts of long-chain fatty acids (carboxylic acids).
Option C: Correct. The hydrophobic tails of soap molecules dissolve in grease, while the hydrophilic heads point outward, trapping grease in the micelle's center.
Option D: Correct. Soap micelles are large enough to scatter a beam of light, demonstrating the Tyndall effect, which is why soap solutions appear cloudy.

How others answered

Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.

Community Performance

Out of everyone who attempted this question.

29%

got it right

Change set

Question map

Which one among the following statements regarding micelles is not correct?

Explanation

SIMILAR QUESTIONS

Which one of the following statements is NOT correct?

Which one of the following statements about the cleansing action of soap is not true?

Assertion (A) : Soaps do not form lather with water containing salts of calcium and magnesium. Reason (R) : Calcium and magnesium salts of long-chain fatty acids are insoluble in water.

The reaction that takes place in soap making is called saponification. Basically soap is sodium or potassium salts of

Consider the following statements : 1. Soap cannot be used in acidic water. 2. Ionic part of a soap is —COO~.Na+. 3. Soap dissolves in water faster than detergent. Which of the statements given above is/are correct?