Copper oxide forms a coloured salt solution when added to dilute acid. What nature of copper oxide is shown?
Answer and explanation
Correct answer: Basic oxide
Copper oxide is a metal oxide and shows basic character. The governing reaction is a neutralisation: basic metal oxide + acid → salt + water. For example, CuO + H₂SO₄ → CuSO₄ + H₂O; the dissolved copper salt gives the solution its characteristic colour. Formation of salt with an acid demonstrates basicity, so option B is correct. It is not an acidic oxide, neutral gas, or salt-free material.
Frequently asked questions
What is the correct answer to this question?
Basic oxide
Why is this the correct answer?
Copper oxide is a metal oxide and shows basic character. The governing reaction is a neutralisation: basic metal oxide + acid → salt + water. For example, CuO + H₂SO₄ → CuSO₄ + H₂O; the dissolved copper salt gives the solution its characteristic colour. Formation of salt with an acid demonstrates basicity, so option B is correct. It is not an acidic oxide, neutral gas, or salt-free material.
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.
