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A student says that aqueous solutions of all salts are neutral. Which example proves this statement wrong?

Answer and explanation

Correct answer: Aqueous ammonium chloride solution, with pH less than 7

The governing concept is salt hydrolysis. Ammonium chloride is formed from strong acid HCl and weak base NH₄OH. In water, NH₄⁺ hydrolyses and increases hydronium-ion concentration, making the solution acidic with pH below 7; therefore option B disproves the statement. NaCl is nearly neutral, distilled water is not a salt, and NaOH is a base rather than a salt.

Related tags

Salt-HydrolysisAmmonium-ChloridePhAcids-Bases-SaltsClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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