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An insoluble substance forms salt and water with acid. Why will it not be called an alkali?

Answer and explanation

Correct answer: Because an alkali is a water-soluble base

The governing distinction is between a base and an alkali. A base reacts with an acid to form salt and water, so the described insoluble substance can be a base. An alkali is specifically a base that dissolves in water and produces hydroxide ions in solution. Because the substance is stated to be insoluble, it cannot be classified as an alkali. Therefore option A is correct; the other choices contradict the given reaction or add unsupported properties.

Related tags

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

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