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Which acid is formed when milk turns sour?

Answer and explanation

Correct answer: Lactic acid

The governing concept is the formation of acids during food spoilage or fermentation. When microorganisms act on lactose in milk, lactic acid is produced, so the pH falls and the milk develops a sour taste. Therefore option A, lactic acid, is correct. Citric acid is characteristic of citrus fruits, whereas sulphuric acid and nitric acid are strong mineral acids and are not formed during ordinary souring of milk. The change also illustrates a chemical change.

Related tags

Lactic AcidMilkFermentationNatural AcidsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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