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| Q. |
Sour milk contains – |
| A. | acetic acid |
| B. | tartaric acid |
| C. | citric acid |
| D. | lactic acid |
| Answer» D. lactic acid | |
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Explanation: Lactic acid, also known as milk acid, is a chemical compound that plays a role in various biochemical processes and was first isolated in 1780 by the Swedish chemist Carl Wilhelm Scheele. Lactic acid is a carboxylic acid with the chemical formula C3H6O3. Lactic acid is found primarily in sour milk products, such as koumiss, laban, yogurt, kefir, and some cottage cheeses. The casein in fermented milk is coagulated (curdled) by lactic acid. |
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