JEE Main · 2017 · 02 Apr 2017 · Offline · Redox Reactions and Electrochemistry

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

(A) $XeF_{4} + O_{2} F_{2} \to XeF_{6} + O_{2}$ ✓ Correct
(B) $XeF_{2} + PF_{5} \to [XeF]^{+} PF_{6}^{-}$
(C) $XeF_{6} + H_{2} O \to XeOF_{4} + 2 HF$
(D) $XeF_{6} + 2 H_{2} O \to XeO_{2} F_{2} + 4 HF$

Answer: (A)

Solution

A redox change needs oxidation numbers to shift. In

XeF X_{4} + O X_{2} F X_{2} XeF X_{6} + O X_{2}

, xenon climbs from

+ 4

+ 6

while oxygen falls from

+ 1

O X_{2} F X_{2}

0

O X_{2}

— a true electron transfer. The other three are only fluoride transfer or hydrolysis, with every oxidation state unchanged, so this is the redox reaction.

JEE Main · 2017 · 02 Apr 2017 · Offline · Single correct option

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