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What can a colour change indicate in a chemical reaction?

Answer and explanation

Correct answer: Formation of a new substance

A colour change in a chemical reaction can indicate the formation of a new substance because the products may have properties different from those of the reactants. A change only in shape, state, or position does not usually form a new substance; these can be physical changes. Exam tip: Colour change, gas evolution, temperature change, and precipitate formation are common signs of a chemical reaction.

Related tags

Chemical ReactionsColour ChangeChemical ChangePhysical ChangeClass 10 Science

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