Why is hydrogen oxidised in the reaction between copper oxide and hydrogen?
Answer and explanation
Correct answer: Hydrogen gains oxygen from copper oxide to form water
In the reaction \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\), hydrogen takes oxygen from copper oxide to form water. Gain of oxygen is oxidation; therefore, hydrogen is oxidised. In terms of electrons, hydrogen’s oxidation number changes from 0 to +1, meaning that it loses electrons. Option C is incorrect because gaining electrons is reduction. Exam tip: Identify oxidation by oxygen gain or electron loss.
Frequently asked questions
What is the correct answer to this question?
Hydrogen gains oxygen from copper oxide to form water
Why is this the correct answer?
In the reaction \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\), hydrogen takes oxygen from copper oxide to form water. Gain of oxygen is oxidation; therefore, hydrogen is oxidised. In terms of electrons, hydrogen’s oxidation number changes from 0 to +1, meaning that it loses electrons. Option C is incorrect because gaining electrons is reduction. Exam tip: Identify oxidation by oxygen gain or electron loss.
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.
