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Which of the following substances is most suitable in an antacid for relieving excess acidity in the stomach?

Answer and explanation

Correct answer: Magnesium hydroxide

The governing concept is neutralisation: an antacid should contain a mild base that reacts safely with excess hydrochloric acid in the stomach. Magnesium hydroxide is suitable because Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O. Sodium hydroxide is a strong, corrosive alkali, while acetic acid and hydrochloric acid would add acidity rather than reduce it. Therefore, option A is correct.

Related tags

Acids And BasesAntacidsNeutralisationMagnesium HydroxideClass 10 ScienceAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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