Why should a chemical reaction be confirmed carefully when only a colour change is observed?
Answer and explanation
Correct answer: A colour change alone is not conclusive proof that a new substance has formed.
A colour change can indicate a chemical reaction, but it is not conclusive by itself because colour may also change during physical processes such as mixing or dissolving substances. Formation of a new substance should be supported by other evidence, such as gas evolution, precipitate formation, a temperature change, or testing the properties of the product. Option B is incorrect because a colour change does not always prove a chemical change.
Frequently asked questions
What is the correct answer to this question?
A colour change alone is not conclusive proof that a new substance has formed.
Why is this the correct answer?
A colour change can indicate a chemical reaction, but it is not conclusive by itself because colour may also change during physical processes such as mixing or dissolving substances. Formation of a new substance should be supported by other evidence, such as gas evolution, precipitate formation, a temperature change, or testing the properties of the product. Option B is incorrect because a colour change does not always prove a chemical change.
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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