Based on the formation of a new substance, what is the correct difference between conversion of milk into curd and conversion of water into ice?
Answer and explanation
Correct answer: New substances form when milk changes into curd, but no new substance forms when water changes into ice.
During conversion of milk into curd, bacterial action produces new substances such as lactic acid and permanently changes the properties of milk. Hence, it is a chemical change. In contrast, freezing water changes only its state; ice is still water and returns to water on melting. Thus, ice formation is a physical change, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
New substances form when milk changes into curd, but no new substance forms when water changes into ice.
Why is this the correct answer?
During conversion of milk into curd, bacterial action produces new substances such as lactic acid and permanently changes the properties of milk. Hence, it is a chemical change. In contrast, freezing water changes only its state; ice is still water and returns to water on melting. Thus, ice formation is a physical change, so option A is correct.
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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