How does a medicine like magnesium hydroxide help when excess acid is produced in the stomach?
Answer and explanation
Correct answer: It neutralises excess acid
Magnesium hydroxide is a sparingly soluble base. The governing concept is neutralisation: its hydroxide ions react with excess hydrochloric acid in the stomach, reducing acidity and discomfort. For example, the overall reaction can be represented as Mg(OH)2 + 2HCl → MgCl2 + 2H2O. Therefore option B is correct; the other options do not describe an antacid reaction.
Frequently asked questions
What is the correct answer to this question?
It neutralises excess acid
Why is this the correct answer?
Magnesium hydroxide is a sparingly soluble base. The governing concept is neutralisation: its hydroxide ions react with excess hydrochloric acid in the stomach, reducing acidity and discomfort. For example, the overall reaction can be represented as Mg(OH)2 + 2HCl → MgCl2 + 2H2O. Therefore option B is correct; the other options do not describe an antacid reaction.
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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