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CAIE IGCSE Chemistry 6.4.8 Redox Reactions As Reactions Involving Questions

Identify paired oxidation and reduction by tracking electron loss and gain, and distinguish redox from precipitation and acid-base reactions.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • identify redox when electrons lost by one species are gained by another
  • pair oxidation and reduction half-equations so transferred electron numbers match
  • identify oxidised and reduced species in chlorine, iodide and metal-ion reactions
  • distinguish electron-transfer redox from precipitation and acid-base reactions

CAIE IGCSE Chemistry 6.4.8 Redox Reactions As Reactions Involving Questions question 1

[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.

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