Which substance is oxidised in the reaction between copper(II) oxide and hydrogen?
Answer and explanation
Correct answer: Hydrogen
The reaction is CuO + H₂ → Cu + H₂O. Hydrogen combines with oxygen from copper(II) oxide to form water, so hydrogen gains oxygen and is oxidised. Copper(II) oxide loses oxygen and becomes copper, so it is reduced. The copper and water shown among the options are products rather than the substance undergoing oxidation. Therefore, option B is correct.
Frequently asked questions
What is the correct answer to this question?
Hydrogen
Why is this the correct answer?
The reaction is CuO + H₂ → Cu + H₂O. Hydrogen combines with oxygen from copper(II) oxide to form water, so hydrogen gains oxygen and is oxidised. Copper(II) oxide loses oxygen and becomes copper, so it is reduced. The copper and water shown among the options are products rather than the substance undergoing oxidation. Therefore, 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: Chemical Reactions and Equations.
