Chemistry · Oct / Nov 2024 · Paper 11 · Question 18

Copper forms a red oxide, Cu2O, and a black oxide, CuO. In the presence of a catalyst, aqueous hydrogen peroxide, H2O2, decomposes to form water. The black oxide has copper in a ......1...... oxidation state than in the red oxide. In forming water, hydrogen peroxide is ......2...... . Which words correctly complete gaps 1 and 2?

1. Ahigher, reduced
2. Bhigher, oxidised
3. Clower, reduced
4. Dlower, oxidised

As printed in the paper