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CAIE IGCSE Chemistry 6.4.2 Redox reactions as involving

Practise deciding when oxidation and reduction occur together, using equations, electron transfer and oxidation-number changes.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • define redox as oxidation and reduction occurring in the same reaction
  • explain redox by pairing electron loss by one species with electron gain by another

6.4.2—Redox reactions as involving question 1

[Maximum number: 1]

When magnesium is added to aqueous copper(II) sulfate a reaction occurs. The ionic equation for the reaction is shown.

Mg+Cu2+→Mg2++Cu\mathrm{Mg}+\mathrm{Cu}^{2+} \rightarrow \mathrm{Mg}^{2+}+\mathrm{Cu}

Explain why this is a redox reaction.

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