JEE Main · 2009 · 12 Apr 2009 · Offline · p-Block Elements

Which one of the following reactions of Xenon compounds is not feasible ?

(A) $XeO_{3} + 6 HF \to Xe F_{6} + 3 H_{2} O$ ✓ Correct
(B) $3 Xe F_{4} + 6 H_{2} O \to 2 Xe + XeO_{3} + 12 HF + 1.5 O_{2}$
(C) $2 XeF_{2} + 2 H_{2} O \to 2 Xe + 4 HF + O_{2}$
(D) $XeF_{6} + RbF \to Rb (XeF_{7}]$

Answer: (A)

Solution

Xenon trioxide is itself a powerful oxidising agent, so it cannot be reduced by hydrogen fluoride back to

Xe F_{6}

; the reaction

Xe O_{3} + 6HF \to Xe F_{6} + 3 H_{2} O

therefore does not proceed and is the unfeasible one. The remaining changes are all known chemistry:

Xe F_{4}

and

Xe F_{2}

hydrolyse to give xenon, hydrogen fluoride and oxygen, and

Xe F_{6}

takes up rubidium fluoride to form the

Rb [Xe F_{7}]

adduct.

JEE Main · 2009 · 12 Apr 2009 · Offline · Single correct option

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