In the reaction CuO + H₂ → Cu + H₂O, the formation of water proves the oxidation of which substance?
Answer and explanation
Correct answer: Hydrogen
In CuO + H₂ → Cu + H₂O, hydrogen combines with oxygen from copper(II) oxide and becomes part of water. By the school-level definition, addition of oxygen is oxidation, so hydrogen is oxidised. At the same time, CuO loses oxygen and changes to copper, so CuO is reduced. Water is a product, not the substance being oxidised, making option B correct.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
In CuO + H₂ → Cu + H₂O, hydrogen combines with oxygen from copper(II) oxide and becomes part of water. By the school-level definition, addition of oxygen is oxidation, so hydrogen is oxidised. At the same time, CuO loses oxygen and changes to copper, so CuO is reduced. Water is a product, not the substance being oxidised, making option B 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.
