Which amongst the following observations does not indicate that a chemical reaction has occurred?

Formation of a precipitate

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Production of gas

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Evolution of heat and light

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Change in total mass of substance

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Solution

The correct option is D Change in total mass of substance
According to law of conservation of mass, during a chemical reaction, there is no change in the total mass of the substance.

However, the indicators of chemical reactions include:
$∙$ change in temperature
$∙$ change in colour
$∙$ formation of precipitate
$∙$ evolution of gases
$∙$ change in odour

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What does the following statement mean? In a chemical reaction, the total mass of the reactants is equal to the total mass of the products.

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