O-LevelChemistryMetals & Reactivity5070/11 · May/June 2022 · Q241 Mark

The table gives some information about four redox reactions. Which row gives correct information about what is oxidised and the evidence that this is oxidation?

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ACuO(s) + C(s) ⇌ CO(g) + Cu(s); copper; copper oxide has given oxygen to carbon

BNa(s) + ½Cl2(g) → NaCl(s); sodium; sodium has lost an electron

CN2(g) + 3H2(g) ⇌ 2NH3(g); nitrogen; nitrogen has gained hydrogen

DZn(NO3)2(aq) + Mg(s) ⇌ Mg(NO3)2(aq) + Zn(s); zinc; zinc has gained two electrons

✓ Correct answer

B: Na(s) + ½Cl2(g) → NaCl(s); sodium; sodium has lost an electron

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2022 Paper 1 Variant 1, question 24.

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