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Chemistry 5070 · Cambridge (CAIE) O Level
Oxidation and Reduction
1 past-paper question on Oxidation and Reduction · examined 2024–2024.
20241 question
5070/11 · O/N · Q18 [1]Sign up to mark my answer →
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?
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