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CAIE IGCSE Chemistry 6.4.2 Redox Reactions As Involving Questions

Recognise redox reactions as simultaneous oxidation and reduction, and explain them through electron loss and gain.

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
  • identify redox changes in reactions involving copper oxide, alcohols and acids

CAIE IGCSE Chemistry 6.4.2 Redox Reactions As Involving Questions question 1

[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

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