Why is the conversion of milk into curd a chemical change?
Answer and explanation
Correct answer: A new substance, curd, with properties different from milk is formed
During curd formation, bacteria convert lactose in milk into lactic acid. The lactic acid coagulates casein protein, forming curd with properties different from those of milk. Because new substances are formed, this is a chemical change. In contrast, separation of fat is only a physical separation of components of a mixture and does not form a new substance.
Frequently asked questions
What is the correct answer to this question?
A new substance, curd, with properties different from milk is formed
Why is this the correct answer?
During curd formation, bacteria convert lactose in milk into lactic acid. The lactic acid coagulates casein protein, forming curd with properties different from those of milk. Because new substances are formed, this is a chemical change. In contrast, separation of fat is only a physical separation of components of a mixture and does not form a new substance.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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