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The aqueous solution of a non-metal oxide turns blue litmus red. What is the nature of the non-metal oxide?

Answer and explanation

Correct answer: Acidic

The governing indicator principle is that an acidic solution changes blue litmus to red. Many non-metal oxides, such as carbon dioxide and sulphur dioxide, dissolve or react with water to form acidic solutions. Therefore the oxide described is acidic, so option B is correct. Option A would be supported by a red-to-blue change, whereas metallic and neutral-solid descriptions do not explain the observed litmus result. The test concerns the solution formed in water.

Related tags

Non-Metal OxideAcidic OxideLitmusAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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