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Which of the following reactions is an example of a redox reaction ?

1. XeF 6 + H 2 O Æ XeOF 4 + 2HF
2. XeF 6 + 2H 2 O Æ XeO 2 F 2 + 4HF
3. XeF 4 + O 2 F 2 Æ XeF 6 + O 2
4. XeF 2 + PF 5 Æ [XeF] + PF 6 –

Correct answer: XeF 4 + O 2 F 2 Æ XeF 6 + O 2

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