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

Question

$Xe{F_6}$ + H₂O $\to$ $XeO{F_4}$ + 2HF

$Xe{F_6}$ + 2H₂O $\to$ $XeO_2{F_2}$ + 4HF

$Xe{F_4}$ + O₂F₂ $\to$ $Xe{F_6}$ + O₂

$Xe{F_2}$ + PF₅ $\to$ ${\left[ {XeF} \right]^ + }PF_6^ - $

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