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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.

Related tags

Chemical ReactionsPhysical ChangeDilutionColour ChangeClass 10 Science

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