NDA 2021 Chemistry question

Not in JEE Main or NEET syllabus

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.Correct
(D)Soap forms insoluble precipitates with the calcium and magnesium ions in hard water.

Answer: (C)

Solution

Soaps are sodium or potassium salts of long-chain carboxylic acids, not ammonium salts; statement (c) is not true. The other statements

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Question ID VK-031772