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Which of the following observations can be a common sign that a chemical reaction has occurred?

Answer and explanation

Correct answer: Evolution of a gas

Evolution of a gas can be a common sign of a chemical reaction because new substances may form during the reaction. For example, an acid reacting with a carbonate produces carbon dioxide gas. In contrast, folding paper, breaking ice, and filtering water are physical changes because no new substance is formed.

Related tags

Class 10 ScienceChemical ReactionsChemical EquationsSigns Of ReactionGas EvolutionPhysical Changes

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