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Identify the reaction involving a xenon compound that does not occur feasibly.

1. 3XeF4 + 6H2O → 2Xe + XeO3 + 12HF + 1.5O2
2. 2XeF2 + 2H2O → 2Xe + 4HF + O2
3. XeF6 + RbF → [Rb][XeF7]
4. XeO3 + 6HF → XeF6 + 3H2O

Correct answer: XeO3 + 6HF → XeF6 + 3H2O

Solution

XeO3 + 6HF -> XeF6 + 3H2O does not occur; the reverse is favourable since XeF6 is readily hydrolysed by water to XeO3, and weak HF cannot reconvert it. The other three reactions (hydrolysis of XeF4/XeF2, and XeF6 + RbF -> [Rb][XeF7]) are all feasible.

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