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CAIE IGCSE Chemistry 6.4.5 Oxidation and Reduction in Redox Questions

Track oxygen transfer, electron transfer or oxidation-number changes to identify oxidised and reduced substances in redox equations.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • name the substance oxidised and justify it by oxygen gain, electron loss or oxidation-number rise
  • name the substance reduced and justify it by oxygen loss, electron gain or oxidation-number fall
  • check that both oxidation and reduction occur in the same equation
  • do not label unchanged spectator species as oxidised or reduced

CAIE IGCSE Chemistry 6.4.5 Oxidation and Reduction in Redox Questions question 1

[Maximum number: 1]

The equation for the reaction of magnesium with carbon dioxide is shown.

2Mg+CO2→2MgO+C2 \mathrm{Mg}+\mathrm{CO}_{2} \rightarrow 2 \mathrm{MgO}+\mathrm{C}

Which statement about this reaction is correct?

A

Magnesium is oxidised and carbon dioxide is reduced.

B

Magnesium is reduced and carbon dioxide is oxidised.

C

Magnesium and carbon dioxide are both oxidised.

D

Magnesium and carbon dioxide are neither oxidised nor reduced.

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