When copper oxide is added to dilute hydrochloric acid, a blue-green solution forms. What does this prove?
Answer and explanation
Correct answer: Copper oxide behaves as a basic oxide and forms salt with acid
Copper oxide is a metal oxide, and its reaction with hydrochloric acid demonstrates the basic nature of many metal oxides. The reaction is CuO + 2HCl → CuCl₂ + H₂O. Copper(II) chloride dissolves in the solution and gives it a blue-green colour, while water is also formed. Thus the observation supports option A: copper oxide reacts with an acid to produce a salt and water. The other options contradict the reaction or the observed chemistry.
Frequently asked questions
What is the correct answer to this question?
Copper oxide behaves as a basic oxide and forms salt with acid
Why is this the correct answer?
Copper oxide is a metal oxide, and its reaction with hydrochloric acid demonstrates the basic nature of many metal oxides. The reaction is CuO + 2HCl → CuCl₂ + H₂O. Copper(II) chloride dissolves in the solution and gives it a blue-green colour, while water is also formed. Thus the observation supports option A: copper oxide reacts with an acid to produce a salt and water. The other options contradict the reaction or the observed chemistry.
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.
