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What is the best way to identify that a chemical reaction has occurred?

Answer and explanation

Correct answer: Observing signs such as a colour change, gas evolution, temperature change, or precipitate formation

In a chemical reaction, new substances are formed. Evidence may include a colour change, gas evolution, a temperature change, or formation of a precipitate. Therefore, option A is correct. For example, a precipitate indicates formation of a new insoluble substance, whereas the shape of the container does not prove that a reaction has occurred.

Related tags

Class 10 ScienceChemical ReactionsChemical EquationsEvidence Of ReactionObservable Changes

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