# Chlorine gas is bubbled into potassium bromide solution. The colourless solution turns orange-brown. Explain what has happened in terms of oxidation and reduction, identifying which species has been oxidised and which has been reduced.

> Cambridge International IGCSE Chemistry (0620) — 6.4 Redox · Explain · 4 marks

> Chlorine gas is bubbled into potassium bromide solution. The colourless solution turns orange-brown.

## Mark scheme (4 marks)

1. Bromide ions are oxidised
2. Bromide ions lose electrons (to form bromine)
3. Chlorine is reduced
4. Chlorine gains electrons (to form chloride ions)

## Key terms

- [oxidation](https://www.gradenine.co.uk/glossary/oxidation)
- [reduction](https://www.gradenine.co.uk/glossary/reduction)
- [chlorine](https://www.gradenine.co.uk/glossary/chlorine)

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- [Revision notes for Cambridge International IGCSE Chemistry (0620)](https://www.gradenine.co.uk/learn)
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