Which of the following changes is the best example of a chemical change?
Answer and explanation
Correct answer: Conversion of milk into curd
During the conversion of milk into curd, bacterial action changes the components of milk and forms new substances; the change is not easily reversible. Hence, it is a chemical change. In contrast, melting ice is only a change of state, and sugar can be recovered from water, so these are physical changes.
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What is the correct answer to this question?
Conversion of milk into curd
Why is this the correct answer?
During the conversion of milk into curd, bacterial action changes the components of milk and forms new substances; the change is not easily reversible. Hence, it is a chemical change. In contrast, melting ice is only a change of state, and sugar can be recovered from water, so these are physical changes.
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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