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Why should a final conclusion about a chemical reaction not be drawn from colour change alone?

Answer and explanation

Correct answer: Because colour change may also result from physical changes such as mixing or dilution and does not confirm the formation of a new substance.

A colour change may indicate a chemical reaction, but by itself it does not prove that a new substance has formed. A change in colour can also be observed during physical processes such as mixing or dilution. Therefore, additional evidence, such as gas evolution, precipitate formation, temperature change, or a suitable test for a new substance, is needed. Option B is incorrect because many chemical reactions do not evolve a gas.

Related tags

ScienceClass10Chemical ReactionsColour ChangeChemical EvidencePhysical Change

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