Copper oxide forms salt and water when added to dilute acid. What is the nature of copper oxide?
Answer and explanation
Correct answer: Basic oxide
Copper(II) oxide reacts with an acid such as hydrochloric acid: CuO + 2HCl → CuCl₂ + H₂O. Formation of salt and water from an acid and a metal oxide is a neutralisation reaction, showing that the oxide has basic character. Most metal oxides are basic, although a few may be amphoteric. Copper oxide is not an acidic oxide, a gas, or a salt, so option B is correct.
Frequently asked questions
What is the correct answer to this question?
Basic oxide
Why is this the correct answer?
Copper(II) oxide reacts with an acid such as hydrochloric acid: CuO + 2HCl → CuCl₂ + H₂O. Formation of salt and water from an acid and a metal oxide is a neutralisation reaction, showing that the oxide has basic character. Most metal oxides are basic, although a few may be amphoteric. Copper oxide is not an acidic oxide, a gas, or a salt, so option B 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.
