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Why cannot a chemical reaction be confirmed on the basis of colour change alone?

Answer and explanation

Correct answer: Because colour change may also result from physical mixing or dissolution; evidence of formation of a new substance is needed.

A colour change can be an indication of a chemical reaction, but it is not conclusive by itself. For example, mixing coloured substances or dissolving a coloured substance can change the colour without forming a new substance. Confirmation of a chemical reaction requires evidence of a change in composition or formation of a new substance. Option B is incorrect because colour change does not always prove a chemical change.

Related tags

ScienceClass 10Chemical ReactionsColour ChangeEvidence Of ReactionChemical Equations

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