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A student takes an antacid to relieve acidity. What type of reaction does an antacid mainly undergo with excess hydrochloric acid present in the stomach?

Answer and explanation

Correct answer: Neutralisation reaction

Antacids are basic substances that neutralise excess hydrochloric acid in the stomach. An acid-base reaction generally produces salt and water; for example, \(Mg(OH)_2 + 2HCl \rightarrow MgCl_2 + 2H_2O\). Hence, this is a neutralisation reaction. In a displacement reaction, one element replaces another element from a compound, which does not happen here. Exam tip: acid + base producing salt + water indicates neutralisation.

Related tags

Acids Bases SaltsNeutralisation ReactionAntacidsHydrochloric AcidAcid Base ReactionClass 10 Science

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