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Which of the following salts has an aqueous solution that turns red litmus paper blue?

Answer and explanation

Correct answer: Sodium carbonate

Sodium carbonate, Na₂CO₃, is formed from the strong base NaOH and the weak acid H₂CO₃. In water, the carbonate ion undergoes hydrolysis and generates OH⁻ ions, making the solution basic. A basic solution turns red litmus blue, so option C is correct. NaCl is nearly neutral, NH₄Cl is acidic, and CuSO₄ is not the expected basic salt in this comparison.

Related tags

Sodium-CarbonateBasic-SaltLitmusSalt-HydrolysisAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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