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A moist gas turns red litmus blue but has no effect on dry litmus. What is the most correct conclusion about the gas?

Answer and explanation

Correct answer: It forms a basic solution in moisture

Litmus changes colour because of acidic or basic species present in an aqueous medium, not simply because a dry gas touches the paper. Turning red litmus blue demonstrates a basic effect, while the absence of a change on dry litmus shows that moisture is required for the gas to dissolve, ionise, or otherwise produce the relevant basic species. The safest conclusion is therefore that the gas forms a basic solution in moisture, making option A correct. The observation does not prove that the gas is a metal or always neutral.

Related tags

Basic GasMoist LitmusIonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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