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CAIE IGCSE Chemistry 6.4.2 Redox reactions as involving

CAIE IGCSE Chemistry 6.4.2 Redox reactions as involving
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

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

How this is tested

  • 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

Question 18

[Maximum number: 1]

Ethanol can be turned into ethanoic acid by passing it over hot copper(II) oxide.

CH3CH2OH+2CuO→CH3COOH+H2O+2Cu\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}+2 \mathrm{CuO} \rightarrow \mathrm{CH}_{3} \mathrm{COOH}+\mathrm{H}_{2} \mathrm{O}+2 \mathrm{Cu}

What is this type of reaction?

A

precipitation

B

redox

C

thermal decomposition

D

neutralisation