A student says that every colour change is a chemical reaction. What is the correct conclusion?
Answer and explanation
Correct answer: A chemical reaction cannot be confirmed from colour change alone.
A colour change can indicate a chemical reaction because newly formed substances may have a different colour. However, colour change alone is not conclusive, since colour may also change because of physical factors such as light, heating, or mixing. Other observations, such as evolution of a gas, formation of a precipitate, or a temperature change, should also be considered. Option B is incorrect because a colour change does not always prove a chemical reaction.
Frequently asked questions
What is the correct answer to this question?
A chemical reaction cannot be confirmed from colour change alone.
Why is this the correct answer?
A colour change can indicate a chemical reaction because newly formed substances may have a different colour. However, colour change alone is not conclusive, since colour may also change because of physical factors such as light, heating, or mixing. Other observations, such as evolution of a gas, formation of a precipitate, or a temperature change, should also be considered. Option B is incorrect because a colour change does not always prove a chemical reaction.
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.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
