On what basis is conversion of milk into curd a chemical change?
Answer and explanation
Correct answer: Curd is a substance with new properties
A chemical change is recognized when one or more new substances with different properties are formed. During curd formation, bacteria convert some lactose into lactic acid, changing the taste, texture, and other properties of milk and producing curd. Thus option B is correct. Cooling, changing colour alone, or transferring milk to another container does not by itself establish formation of a new substance.
Frequently asked questions
What is the correct answer to this question?
Curd is a substance with new properties
Why is this the correct answer?
A chemical change is recognized when one or more new substances with different properties are formed. During curd formation, bacteria convert some lactose into lactic acid, changing the taste, texture, and other properties of milk and producing curd. Thus option B is correct. Cooling, changing colour alone, or transferring milk to another container does not by itself establish formation of 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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