JEE Main 2017 · 2 Apr · Shift 1 · Chemistry Q43

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ChemistrySingle correct+4 / -1Question 43 of 90

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

\ce{XeF6 + H2O -> XeOF4 + 2HF}

\ce{XeF6 + 2H2O -> XeO2F2 + 4HF}

\ce{XeF4 + O2F2 -> XeF6 + O2}

\ce{XeF2 + PF5 -> [XeF]+ PF6-}

Answer and worked solution

Official answer: C

In $\ce{XeF4 + O2F2 -> XeF6 + O2}$ , Xe goes from +4 to +6 and O from +1 to 0, so it is a redox reaction. The other three involve no change of oxidation state.

Topics:Group 18 Oxidation number

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JEE Main 2017 · 2 Apr · Shift 1, Chemistry question 43