Explanation

The question asks which statement is not correct. Soap molecules are sodium or potassium salts of long-chain carboxylic acids (A true). Grease and oil dissolve in the hydrophobic interior at the centre of the micelle (C true), and soap micelles scatter light by the Tyndall effect (D true). Micelles do not precipitate out of solution; their similarly charged outer surfaces repel each other (ion-ion repulsion), which keeps the emulsion stable and dispersed. Hence option B is the not-correct statement.