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NEET levelSingle correct optionDifficulty 1 of 3el040

Soap forms an insoluble scum in hard water because the water contains

A $Na X^{+}$ and $K X^{+}$ ions
B $H X^{+}$ and $OH X^{-}$ ions only
Cdissolved nitrogen and oxygen
D $Ca X^{2 +}$ and $Mg X^{2 +}$ ions

Answer: D

Calcium and magnesium ions react with the fatty acid anions to give insoluble calcium and magnesium salts, which separate as scum.

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