Which amongst the following observations may indicate the occurrence of a chemical reaction?
A
Formation of precipitate
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B
Evolution of gas
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C
Evolution of heat or light energy
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D
All of the above.
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Solution
The correct option is D All of the above. The indicators of chemical reaction include: ∙ change in colour ∙ formation of precipitate ∙ evolution of gas ∙ change in odour ∙ evolution or absorption of energy in the form of heat, light, etc.