Which ions form water during neutralisation?
Answer and explanation
Correct answer: Hydrogen ion and hydroxide ion
The essential ionic step in neutralisation is H+ + OH− → H2O. Acids furnish hydrogen ions in aqueous solution, while soluble bases furnish hydroxide ions. These ions combine to form water; spectator ions such as Na+ and Cl− remain in solution and can form sodium chloride. Calcium-carbonate and copper-sulphate pairs do not represent the general water-forming step, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
Hydrogen ion and hydroxide ion
Why is this the correct answer?
The essential ionic step in neutralisation is H+ + OH− → H2O. Acids furnish hydrogen ions in aqueous solution, while soluble bases furnish hydroxide ions. These ions combine to form water; spectator ions such as Na+ and Cl− remain in solution and can form sodium chloride. Calcium-carbonate and copper-sulphate pairs do not represent the general water-forming step, so option A is correct.
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.
