Xenic acid is a proposed noble gas compound with the chemical formula H2XeO4 or XeO2(OH)2.

It has not been isolated, and the published characterization data are ambiguous.

[2] Salts of xenic acid are called xenates, containing the HXeO−4 anion, such as monosodium xenate.

They tend to disproportionate into xenon gas and perxenates:[3] The energy given off is sufficient to form ozone from diatomic oxygen: Salts containing the deprotonated anion XeO2−4 are presently unknown.

This inorganic compound–related article is a stub.