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Which is the most appropriate indication that a chemical reaction has occurred in the laboratory?

Answer and explanation

Correct answer: A colour change, evolution of a gas, temperature change, or formation of a precipitate

During a chemical reaction, new substances are formed, and observable evidence may include a colour change, gas evolution, a temperature change, or precipitate formation. Therefore, option A is an appropriate indication of a reaction. In contrast, merely knowing the names of the reactants does not show that a reaction has occurred.

Related tags

Class 10 ScienceChemical ReactionsReaction IndicatorsLaboratory ObservationChemical Changes

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