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If gas evolves in a reaction but the colour does not change, what is the correct conclusion?

Answer and explanation

Correct answer: Gas evolution can also be a sign of a chemical reaction

Chemical reactions may show different observable signs, and no single sign must appear in every reaction. Evolution of a gas can indicate that a new gaseous substance has formed, even if the colour remains unchanged. Therefore option A is the correct conclusion. Colour change is only one possible indicator, and gas evolution is not automatically a physical change; its cause and the substances involved must be considered.

Related tags

ScienceClass-10Gas-EvolutionReaction-IndicatorsChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourClass 10 Mcq

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