Iridium yana samar da mahadi a cikin yanayin oxidation tsakanin -3 da +9; yanayin oxidation da aka fi sani shine +3 da +4. Misalai masu kyau na yanayin oxidation mai girma +6 suna da wuya, amma sun haɗa da IrF6 da kuma nau'ikan hade guda biyu Sr2MgIrO6 da Sr2CaIrO6. Bugu da ƙari, an ba da rahoto a cikin 2009 cewa an shirya iridium (((VIII) oxide (IrO4) a ƙarƙashin yanayin keɓewa na matrix (6 K a Ar) ta hanyar haskakawa na iridium-peroxo complex. Wannan nau'in, duk da haka, ba a tsammanin zai kasance mai karko a matsayin mai ƙarfi mai ƙarfi a yanayin zafi mai zafi. Mafi girman yanayin oxidation (+9), wanda kuma shine mafi girma da aka rubuta don kowane abu, an san shi ne kawai a cikin yanayin oxidation guda ɗaya, cO4; Iridium an san shi ne kawai a matsayin gas-gas kuma ba a san shi da samar da kowane nau'i mai ƙarancin oxidation.
da IrH4−5 da 18-electron IrH5−4 anion