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CAIE IGCSE Chemistry Identifying Electron-Transfer Redox

CAIE IGCSE Chemistry Identifying Electron-Transfer Redox
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise identifying redox reactions through simultaneous electron loss and gain, pairing half-equations and tracing electron flow between species.

How this is tested

  • identify redox when electrons lost by one species are gained by another species
  • pair oxidation and reduction half-equations so transferred electron numbers match
  • distinguish electron-transfer redox from precipitation, acid-base or other reactions

Question 23

[Maximum number: 1]

Chlorine displaces bromine from aqueous potassium bromide.
The ionic equation for the reaction is shown.

Cl2+2Br−→2Cl−+Br2\mathrm{Cl}_{2}+2 \mathrm{Br}^{-} \rightarrow 2 \mathrm{Cl}^{-}+\mathrm{Br}_{2}

Which statement about this reaction is correct?

A

Bromide ions act as an oxidising agent.

B

Bromide ions are oxidised as electrons are lost.

C

Chlorine acts as a reducing agent.

D

Chlorine is reduced as electrons are lost.