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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.

Related tags

ScienceClass10Chemical-ReactionsChemical-EquationsColour-ChangeObservations

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