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A substance forms salt and water with acid but is insoluble in water. What is it called?

Answer and explanation

Correct answer: Base

A base is a substance that reacts with an acid in a neutralisation reaction to produce salt and water. Solubility is the key distinction in this question: a base may be soluble or insoluble in water, whereas an alkali is specifically a base that dissolves in water and produces hydroxide ions in solution. Since the substance is stated to be insoluble, it cannot be called an alkali. It is therefore correctly identified as a base, making A the only suitable answer.

Related tags

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

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