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If bubbles are observed during a chemical reaction, what do they usually indicate?

Answer and explanation

Correct answer: Formation of a gas

Bubbles appearing during a reaction usually provide evidence that a gas is being produced or released, so option A is correct. For example, an acid reacting with a carbonate can form carbon dioxide, which escapes as bubbles. A precipitate is an insoluble solid seen as particles or cloudiness, whereas melting and evaporation are physical changes and do not generally explain reaction bubbles.

Related tags

Class 10 ScienceChemical ReactionsGas EvolutionChemical ChangeObservationsChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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