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.
Frequently asked questions
What is the correct answer to this question?
Lactic acid
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
