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If a salt is formed from a strong base and a weak acid, what effect will its aqueous solution generally show on red litmus?

Answer and explanation

Correct answer: It will turn red litmus blue

The governing idea is salt hydrolysis. A salt produced from a strong base and a weak acid generally gives a basic aqueous solution because the anion of the weak acid reacts with water and generates some OH⁻ ions. Basic solutions turn red litmus blue. The exact strength depends on concentration and hydrolysis, but the expected school-level result is basicity. Therefore option A is correct; the other colour changes are not standard acid-base indicators.

Related tags

Basic SaltLitmusSalt HydrolysisAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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