Why is conversion of milk into curd considered a chemical change in advanced questions?
Answer and explanation
Correct answer: Because curd is a substance with new properties
The governing criterion for a chemical change is the formation of one or more substances with different properties. During curd formation, microorganisms convert some milk sugar into lactic acid, changing the taste, texture and acidity and producing curd with new properties. The process is not merely cooling, changing containers or freezing the same substance. Therefore option A is correct, even though the change occurs gradually and may not be easily reversed.
Frequently asked questions
What is the correct answer to this question?
Because curd is a substance with new properties
Why is this the correct answer?
The governing criterion for a chemical change is the formation of one or more substances with different properties. During curd formation, microorganisms convert some milk sugar into lactic acid, changing the taste, texture and acidity and producing curd with new properties. The process is not merely cooling, changing containers or freezing the same substance. Therefore option A is correct, even though the change occurs gradually and may not be easily reversed.
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.
