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Which of the following substances provides hydroxide ions (OH−) when dissolved in water?

Answer and explanation

Correct answer: Sodium hydroxide

According to the aqueous definition of a base, a substance that produces hydroxide ions in water shows basic behaviour. Sodium hydroxide dissociates as NaOH → Na+ + OH−, so option B is correct. Hydrochloric acid produces hydrogen ions, carbon dioxide forms carbonic acid in water, and sodium chloride separates into sodium and chloride ions without directly providing hydroxide ions.

Related tags

ScienceClass10Acids-BasesHydroxide-IonsSodium-HydroxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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