In the reaction between heated copper(II) oxide and hydrogen, what does hydrogen change into?
Answer and explanation
Correct answer: Water
The reaction is CuO + H₂ → Cu + H₂O. Hydrogen combines with the oxygen removed from copper(II) oxide, so it changes into water. At the same time, CuO loses oxygen and is reduced to copper, while hydrogen gains oxygen and is oxidised. Oxygen itself is not produced, and hydrogen peroxide is not the product under these conditions. Hence option A is correct.
Frequently asked questions
What is the correct answer to this question?
Water
Why is this the correct answer?
The reaction is CuO + H₂ → Cu + H₂O. Hydrogen combines with the oxygen removed from copper(II) oxide, so it changes into water. At the same time, CuO loses oxygen and is reduced to copper, while hydrogen gains oxygen and is oxidised. Oxygen itself is not produced, and hydrogen peroxide is not the product under these conditions. Hence 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: Chemical Reactions and Equations.
