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Which ions combine to form water during neutralisation?

Answer and explanation

Correct answer: Hydrogen ion and hydroxide ion

During neutralisation, an acid supplies hydrogen ions, H⁺, and a base supplies hydroxide ions, OH⁻. These ions combine in a 1:1 ratio according to H⁺ + OH⁻ → H₂O, producing water. Therefore, option B is correct. Sodium and chloride ions can form sodium chloride, but they do not form water; the other ion pairs are unrelated to the water-forming step.

Related tags

Hydrogen IonHydroxide IonNeutralisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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