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In an unknown reaction, the colour changes, heat is released, and a gas forms. What is the most suitable conclusion?

Answer and explanation

Correct answer: There is a strong possibility of a chemical reaction

The governing concept is identifying evidence of a chemical reaction. A colour change, release of heat, and formation of a gas are observable indicators that new substances may have formed. Because several indicators occur together, option A is the strongest conclusion. A physical change usually does not produce such combined evidence, while options C and D contradict the observations.

Related tags

ScienceClass10Chemical ReactionsObservationsSigns Of ReactionChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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