5IF7 + I2O5 ⇄ 2IF5 + 5IOF5
Iodine(VII) fluoride react with iodine(V) oxide to produce iodine(V) fluoride and iodine(VII) pentafluoride-oxide. Iodine(VII) fluoride - liquid. Iodine(V) oxide - solid. This reaction takes place at a temperature of 5-7°C.