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.
Frequently asked questions
What is the correct answer to this question?
It is mildly basic
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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