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A solution turns blue litmus red but the same substance in dry form has no effect on litmus. What is the most appropriate reason?

Answer and explanation

Correct answer: Dry substance has no water for ion formation

Acidic behaviour in aqueous solution depends on the formation of hydrogen or hydronium ions. Water allows an acid to ionise or dissociate, and these ions change blue litmus to red. In the dry state, ions are not freely available to move and interact with the indicator, so the colour change may not occur. Thus A gives the appropriate reason. The other choices contradict the definition and use of acid–base indicators.

Related tags

Acidic BehaviourWaterLitmusAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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