Perxenic acid

Perxenic acid, H₄XeO₆, is a hypothetical acid which is actually an aqueous solution of xenon tetroxide (like chromium trioxide, in which some believe that there is really chromic acid in water).

It is a very strong oxidizing agent, and very acidic, though weaker than perchloric acid. Being a tetrabasic acid, four forms of salts may form.

Giving silver perxenate as an example, monosilver trihydrogenperxenate, AgH₃XeO₆, disilver dihydrogenperxenate, Ag₂H₂XeO₆, trisilver hydrogenperxenate, Ag₃HXeO₆, and tetrasilver perxenate, Ag₄XeO₆, may be formed.

It is non-analogous to any other acid, but xenon tetroxide may be classified together (though not comparable) with osmium tetroxide (osmic acid).