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A student chooses a substance to relieve acidity by neutralising excess hydrochloric acid in the stomach. Which of the following is suitable?

Answer and explanation

Correct answer: Magnesium hydroxide

The governing concept is acid-base neutralisation in an antacid. Magnesium hydroxide, Mg(OH)₂, is a mild base and reacts with excess stomach hydrochloric acid: Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O. This consumes acid and provides relief when used appropriately. Sodium chloride does not neutralise the acid, while ethanoic acid and lemon juice are acidic and would not be suitable antacids. Hence option A is correct.

Related tags

Acids Bases SaltsAntacidsNeutralisationMagnesium HydroxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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