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Why is milk of magnesia useful for relieving stomach acidity?

Answer and explanation

Correct answer: It is mildly basic

Milk of magnesia is a suspension of magnesium hydroxide, Mg(OH)2, which behaves as a weak or mildly basic substance in this context. Stomach acidity is associated with excess hydrochloric acid. Magnesium hydroxide reacts with and neutralises part of that acid, thereby reducing irritation. Hence option A identifies the relevant property. It is not a strong acid, and the statements about being merely a metal or not being a salt do not explain its antacid action.

Related tags

ScienceClass10Milk-Of-MagnesiaAntacidNeutralisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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