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Question

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.

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