The acid present in curd/sour milk is (1) Acetic acid (2) Formic acid (3) Lactic acid (4) Hydrochloric acid

Answer: (3)

The curd is produced due to the presence of reaction between lactic acid bacteria and the milk protein casein. Lactic Acid or milk acid is an organic acid with chemical formula C3H6O3. When milk sugar or lactose undergoes fermentation, the product obtained is lactic acid. It is found in cottage cheese, leban, sour milk, yogurt, and Koumiss.

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