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In which condition can conservation of mass be checked most correctly?

Answer and explanation

Correct answer: Comparing total mass after carrying out reaction in a closed container

The law of conservation of mass states that total mass remains constant in a chemical reaction when matter is not allowed to enter or leave the system. A closed container retains reactants and any gaseous products, so measuring and comparing the total mass before and after the reaction provides the best test. Therefore A is correct; colour and smell are qualitative observations, not mass measurements.

Related tags

ScienceClass10Conservation-Of-MassClosed-SystemChemical-ReactionsChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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