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In an unknown process a new substance formed gas evolved and total mass remained same in a closed container. What is the most suitable conclusion?

Answer and explanation

Correct answer: A chemical reaction occurred, and the law of conservation of mass was obeyed

Formation of a new substance is clear evidence of a chemical reaction, and gas evolution is a common observation during such reactions. In a closed container, no matter enters or leaves, so the total mass of reactants and products remains unchanged. Therefore, A is correct. B is incorrect because a physical change does not form a new substance. Exam tip: For a reaction in a closed system, compare total mass before and after the reaction using the law of conservation of mass.

Related tags

Class 10 ScienceChemical ReactionsConservation Of MassClosed SystemChemical ChangeChemical Equations

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