Why should a chemical reaction not be confirmed carelessly from colour change alone?
Answer and explanation
Correct answer: Colour change alone may not be conclusive proof that a new substance has formed
A colour change can be a possible sign of a chemical reaction, but by itself it is not conclusive proof that a new substance has formed. Colour may also change due to light, mixing of substances, or other physical changes. Therefore, look for further evidence such as gas evolution, precipitate formation, temperature change, or new properties. Option A is incorrect because many chemical reactions do produce a colour change. Exam tip: Use more than one observation to confirm the formation of a new substance.
Frequently asked questions
What is the correct answer to this question?
Colour change alone may not be conclusive proof that a new substance has formed
Why is this the correct answer?
A colour change can be a possible sign of a chemical reaction, but by itself it is not conclusive proof that a new substance has formed. Colour may also change due to light, mixing of substances, or other physical changes. Therefore, look for further evidence such as gas evolution, precipitate formation, temperature change, or new properties. Option A is incorrect because many chemical reactions do produce a colour change. Exam tip: Use more than one observation to confirm the 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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