When sodium hydroxide is added to an acidic solution, which ions combine to form water during neutralisation?
Answer and explanation
Correct answer: Hydrogen ion and hydroxide ion
Neutralisation is governed by the ionic reaction H⁺ + OH⁻ → H₂O. An acid supplies hydrogen ions, while sodium hydroxide dissociates in water to supply hydroxide ions. These two ions combine directly to form water; sodium and the acid’s negative ion remain as spectator ions in solution. Thus option A is correct, while the other pairs do not form water in this reaction.
Frequently asked questions
What is the correct answer to this question?
Hydrogen ion and hydroxide ion
Why is this the correct answer?
Neutralisation is governed by the ionic reaction H⁺ + OH⁻ → H₂O. An acid supplies hydrogen ions, while sodium hydroxide dissociates in water to supply hydroxide ions. These two ions combine directly to form water; sodium and the acid’s negative ion remain as spectator ions in solution. Thus option A is correct, while the other pairs do not form water in this reaction.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
