O-LevelChemistryMetals & Reactivity5070/11 · Oct/Nov 2024 · Q181 Mark

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?

A1: higher, 2: reduced

B1: higher, 2: oxidised

C1: lower, 2: reduced

D1: lower, 2: oxidised

✓ Correct answer

A: 1: higher, 2: reduced

Oracle Prep sorts past-paper questions by topic, so you can drill Metals & Reactivity and see which topics are most likely to come up next.

Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2024 Paper 1 Variant 1, question 18.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content