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If a colour change is observed in a process, can it be identified conclusively as a chemical reaction on this basis alone?

Answer and explanation

Correct answer: No, colour change may be an indicator; formation of new substances or other suitable evidence must also be checked.

A colour change may be an observation associated with a chemical reaction, but it is not conclusive evidence by itself. Colour can also change during dissolution, mixing, or another physical change. Confirmation of a chemical reaction requires evidence of formation of new substances and may include observations such as gas evolution, precipitate formation, or a temperature change. Therefore, option B is incorrect because not every colour change is caused by a chemical reaction.

Related tags

ScienceClass-10Chemical-ReactionsChemical-EquationsColour-ChangeEvidence

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