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Why are all bases not alkalis?

Answer and explanation

Correct answer: Because all bases are not soluble in water

The governing concept is solubility. A base is a substance that can neutralise an acid, whereas an alkali is specifically a base that dissolves in water and produces hydroxide ions in solution. Some bases, such as copper(II) oxide, are insoluble or only sparingly soluble in water. Therefore, option B is correct; options A, C and D contradict the definitions and properties of bases.

Related tags

BasesAlkalisSolubilityAcidsAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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