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Which pair shows the correct common name and chemical name?

Answer and explanation

Correct answer: Washing soda and sodium carbonate decahydrate

Washing soda is sodium carbonate decahydrate, with the formula Na₂CO₃·10H₂O; hence option A gives a correct common-name and chemical-name pair. Baking soda is sodium hydrogen carbonate, bleaching powder is not sodium chloride, and Plaster of Paris is calcium sulphate hemihydrate rather than calcium carbonate. These comparisons eliminate B, C, and D and confirm A unambiguously.

Related tags

Washing SodaCommon NamesHydrated SaltsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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