When water is added to a coloured solution, its colour becomes lighter, but no new substance is formed. What does this change represent?
Answer and explanation
Correct answer: A physical change caused by dilution
When water is added to a coloured solution, the colour becomes lighter because the solution is diluted. Its concentration changes, but no new substance is formed, so this is a physical change. A change in colour or colour intensity alone is not definite proof of a chemical reaction. In contrast, a chemical reaction produces new substances.
Frequently asked questions
What is the correct answer to this question?
A physical change caused by dilution
Why is this the correct answer?
When water is added to a coloured solution, the colour becomes lighter because the solution is diluted. Its concentration changes, but no new substance is formed, so this is a physical change. A change in colour or colour intensity alone is not definite proof of a chemical reaction. In contrast, a chemical reaction produces new substances.
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.
