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In an experiment, dry litmus is unaffected, but the same gas changes moist litmus colour. What is the best conclusion?

Answer and explanation

Correct answer: The gas needs moisture to show acidic or basic properties

The governing concept is that acid or base behaviour of many gases appears only in the presence of water. Moisture allows the gas to dissolve and form ions; those ions then interact with the litmus indicator and change its colour. Dry litmus lacks the water needed for this ion formation, so it remains unchanged. Therefore option A is correct. The other options incorrectly call the indicators defective or deny that the gas is a substance.

Related tags

Moist LitmusAcidic GasIons In WaterAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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